diff --git a/lib/selectors/nav-selectors.js b/lib/selectors/nav-selectors.js
--- a/lib/selectors/nav-selectors.js
+++ b/lib/selectors/nav-selectors.js
@@ -14,11 +14,12 @@
 import type { CalendarFilter } from '../types/filter-types.js';
 import type {
   ThreadInfo,
+  MinimallyEncodedRelativeMemberInfo,
   RawThreadInfo,
 } from '../types/minimally-encoded-thread-permissions-types.js';
 import type { BaseNavInfo } from '../types/nav-types.js';
 import type { BaseAppState } from '../types/redux-types.js';
-import type { RelativeMemberInfo } from '../types/thread-types';
+import type { LegacyRelativeMemberInfo } from '../types/thread-types';
 import type { UserInfo } from '../types/user-types.js';
 import { getConfig } from '../utils/config.js';
 import { values } from '../utils/objects.js';
@@ -83,12 +84,17 @@
 const useENSNamesOptions = { allAtOnce: true };
 
 function useUserSearchIndex(
-  userInfos: $ReadOnlyArray<UserInfo | RelativeMemberInfo>,
+  userInfos: $ReadOnlyArray<
+    UserInfo | LegacyRelativeMemberInfo | MinimallyEncodedRelativeMemberInfo,
+  >,
 ): SearchIndex {
   const membersWithENSNames = useENSNames(userInfos, useENSNamesOptions);
 
   const memberMap = React.useMemo(() => {
-    const result = new Map<string, UserInfo | RelativeMemberInfo>();
+    const result = new Map<
+      string,
+      UserInfo | LegacyRelativeMemberInfo | MinimallyEncodedRelativeMemberInfo,
+    >();
     for (const userInfo of membersWithENSNames) {
       result.set(userInfo.id, userInfo);
     }
diff --git a/lib/selectors/thread-selectors.js b/lib/selectors/thread-selectors.js
--- a/lib/selectors/thread-selectors.js
+++ b/lib/selectors/thread-selectors.js
@@ -40,6 +40,7 @@
 import type { EntryInfo } from '../types/entry-types.js';
 import type { MessageStore, RawMessageInfo } from '../types/message-types.js';
 import type {
+  MinimallyEncodedRelativeMemberInfo,
   ThreadInfo,
   RawThreadInfo,
 } from '../types/minimally-encoded-thread-permissions-types.js';
@@ -52,7 +53,7 @@
 } from '../types/thread-types-enum.js';
 import type {
   SidebarInfo,
-  RelativeMemberInfo,
+  LegacyRelativeMemberInfo,
   MixedRawThreadInfos,
   RawThreadInfos,
 } from '../types/thread-types.js';
@@ -351,7 +352,9 @@
     relativeMemberInfoSelectorForMembersOfThread(threadID),
     (
       threadInfo: ?RawThreadInfo,
-      members: $ReadOnlyArray<RelativeMemberInfo>,
+      members: $ReadOnlyArray<
+        LegacyRelativeMemberInfo | MinimallyEncodedRelativeMemberInfo,
+      >,
     ): boolean => {
       if (!threadInfo) {
         return false;
diff --git a/lib/selectors/user-selectors.js b/lib/selectors/user-selectors.js
--- a/lib/selectors/user-selectors.js
+++ b/lib/selectors/user-selectors.js
@@ -9,13 +9,16 @@
 } from '../shared/avatar-utils.js';
 import { getSingleOtherUser } from '../shared/thread-utils.js';
 import type { ClientEmojiAvatar } from '../types/avatar-types';
-import type { RawThreadInfo } from '../types/minimally-encoded-thread-permissions-types.js';
+import type {
+  MinimallyEncodedRelativeMemberInfo,
+  RawThreadInfo,
+} from '../types/minimally-encoded-thread-permissions-types.js';
 import type { BaseAppState } from '../types/redux-types.js';
 import { userRelationshipStatus } from '../types/relationship-types.js';
 import { threadTypes } from '../types/thread-types-enum.js';
 import type {
   LegacyRawThreadInfo,
-  RelativeMemberInfo,
+  LegacyRelativeMemberInfo,
   RawThreadInfos,
 } from '../types/thread-types.js';
 import type {
@@ -106,14 +109,18 @@
   return relativeMemberInfos;
 }
 
-const emptyArray: $ReadOnlyArray<RelativeMemberInfo> = [];
+const emptyArray: $ReadOnlyArray<
+  LegacyRelativeMemberInfo | MinimallyEncodedRelativeMemberInfo,
+> = [];
 
 // Includes current user at the start
 const baseRelativeMemberInfoSelectorForMembersOfThread: (
   threadID: ?string,
-) => (state: BaseAppState<>) => $ReadOnlyArray<RelativeMemberInfo> = (
-  threadID: ?string,
-) => {
+) => (
+  state: BaseAppState<>,
+) => $ReadOnlyArray<
+  LegacyRelativeMemberInfo | MinimallyEncodedRelativeMemberInfo,
+> = (threadID: ?string) => {
   if (!threadID) {
     return () => emptyArray;
   }
@@ -128,9 +135,11 @@
 
 const relativeMemberInfoSelectorForMembersOfThread: (
   threadID: ?string,
-) => (state: BaseAppState<>) => $ReadOnlyArray<RelativeMemberInfo> = _memoize(
-  baseRelativeMemberInfoSelectorForMembersOfThread,
-);
+) => (
+  state: BaseAppState<>,
+) => $ReadOnlyArray<
+  LegacyRelativeMemberInfo | MinimallyEncodedRelativeMemberInfo,
+> = _memoize(baseRelativeMemberInfoSelectorForMembersOfThread);
 
 const userInfoSelectorForPotentialMembers: (state: BaseAppState<>) => {
   [id: string]: AccountUserInfo,
diff --git a/lib/shared/markdown.js b/lib/shared/markdown.js
--- a/lib/shared/markdown.js
+++ b/lib/shared/markdown.js
@@ -8,10 +8,13 @@
   decodeChatMentionText,
 } from './mention-utils.js';
 import { useENSNames } from '../hooks/ens-cache.js';
-import type { ResolvedThreadInfo } from '../types/minimally-encoded-thread-permissions-types.js';
+import type {
+  MinimallyEncodedRelativeMemberInfo,
+  ResolvedThreadInfo,
+} from '../types/minimally-encoded-thread-permissions-types.js';
 import type {
   ChatMentionCandidates,
-  RelativeMemberInfo,
+  LegacyRelativeMemberInfo,
 } from '../types/thread-types.js';
 
 // simple-markdown types
@@ -201,7 +204,9 @@
 
 const useENSNamesOptions = { allAtOnce: true };
 function useMemberMapForUserMentions(
-  members: $ReadOnlyArray<RelativeMemberInfo>,
+  members: $ReadOnlyArray<
+    LegacyRelativeMemberInfo | MinimallyEncodedRelativeMemberInfo,
+  >,
 ): $ReadOnlyMap<string, string> {
   const membersWithRole = React.useMemo(
     () => members.filter(member => member.role),
@@ -209,11 +214,13 @@
   );
 
   const resolvedMembers = useENSNames(membersWithRole, useENSNamesOptions);
-  const resolvedMembersMap: $ReadOnlyMap<string, RelativeMemberInfo> =
-    React.useMemo(
-      () => new Map(resolvedMembers.map(member => [member.id, member])),
-      [resolvedMembers],
-    );
+  const resolvedMembersMap: $ReadOnlyMap<
+    string,
+    LegacyRelativeMemberInfo | MinimallyEncodedRelativeMemberInfo,
+  > = React.useMemo(
+    () => new Map(resolvedMembers.map(member => [member.id, member])),
+    [resolvedMembers],
+  );
 
   const membersMap = React.useMemo(() => {
     const map = new Map<string, string>();
diff --git a/lib/shared/mention-utils.js b/lib/shared/mention-utils.js
--- a/lib/shared/mention-utils.js
+++ b/lib/shared/mention-utils.js
@@ -8,13 +8,14 @@
 import { useENSNames } from '../hooks/ens-cache.js';
 import { useUserSearchIndex } from '../selectors/nav-selectors.js';
 import type {
+  MinimallyEncodedRelativeMemberInfo,
   ResolvedThreadInfo,
   ThreadInfo,
 } from '../types/minimally-encoded-thread-permissions-types.js';
 import { threadTypes } from '../types/thread-types-enum.js';
 import type {
   ChatMentionCandidates,
-  RelativeMemberInfo,
+  LegacyRelativeMemberInfo,
 } from '../types/thread-types.js';
 import { chatNameMaxLength, idSchemaRegex } from '../utils/validation-utils.js';
 
@@ -30,7 +31,7 @@
 
 type MentionTypeaheadUserSuggestionItem = {
   +type: 'user',
-  +userInfo: RelativeMemberInfo,
+  +userInfo: LegacyRelativeMemberInfo | MinimallyEncodedRelativeMemberInfo,
 };
 
 type MentionTypeaheadChatSuggestionItem = {
@@ -107,7 +108,9 @@
 
 const useENSNamesOptions = { allAtOnce: true };
 function useMentionTypeaheadUserSuggestions(
-  threadMembers: $ReadOnlyArray<RelativeMemberInfo>,
+  threadMembers: $ReadOnlyArray<
+    LegacyRelativeMemberInfo | MinimallyEncodedRelativeMemberInfo,
+  >,
   typeaheadMatchedStrings: ?TypeaheadMatchedStrings,
 ): $ReadOnlyArray<MentionTypeaheadUserSuggestionItem> {
   const userSearchIndex = useUserSearchIndex(threadMembers);
@@ -186,7 +189,9 @@
 function useUserMentionsCandidates(
   threadInfo: ThreadInfo,
   parentThreadInfo: ?ThreadInfo,
-): $ReadOnlyArray<RelativeMemberInfo> {
+): $ReadOnlyArray<
+  LegacyRelativeMemberInfo | MinimallyEncodedRelativeMemberInfo,
+> {
   return React.useMemo(() => {
     if (threadInfo.type !== threadTypes.SIDEBAR) {
       return threadInfo.members;
diff --git a/lib/shared/thread-utils.js b/lib/shared/thread-utils.js
--- a/lib/shared/thread-utils.js
+++ b/lib/shared/thread-utils.js
@@ -58,6 +58,7 @@
   type ComposableMessageInfo,
 } from '../types/message-types.js';
 import type {
+  MinimallyEncodedRelativeMemberInfo,
   MinimallyEncodedRoleInfo,
   RawThreadInfo,
   MinimallyEncodedThreadCurrentUserInfo,
@@ -89,6 +90,7 @@
 } from '../types/thread-types-enum.js';
 import type {
   LegacyRawThreadInfo,
+  LegacyRelativeMemberInfo,
   MemberInfo,
   ServerThreadInfo,
   RoleInfo,
@@ -97,7 +99,6 @@
   NewThreadResult,
   ChangeThreadSettingsPayload,
   UserProfileThreadInfo,
-  RelativeMemberInfo,
   MixedRawThreadInfos,
 } from '../types/thread-types.js';
 import { updateTypes } from '../types/update-types-enum.js';
@@ -219,17 +220,18 @@
 }
 
 function threadActualMembers(
-  memberInfos: $ReadOnlyArray<MemberInfo | RelativeMemberInfo>,
+  memberInfos: $ReadOnlyArray<
+    MemberInfo | LegacyRelativeMemberInfo | MinimallyEncodedRelativeMemberInfo,
+  >,
 ): $ReadOnlyArray<string> {
   return memberInfos
     .filter(memberInfo => memberInfo.role)
     .map(memberInfo => memberInfo.id);
 }
 
-function threadOtherMembers<T: MemberInfo | RelativeMemberInfo>(
-  memberInfos: $ReadOnlyArray<T>,
-  viewerID: ?string,
-): $ReadOnlyArray<T> {
+function threadOtherMembers<
+  T: MemberInfo | LegacyRelativeMemberInfo | MinimallyEncodedRelativeMemberInfo,
+>(memberInfos: $ReadOnlyArray<T>, viewerID: ?string): $ReadOnlyArray<T> {
   return memberInfos.filter(
     memberInfo => memberInfo.role && memberInfo.id !== viewerID,
   );
@@ -459,7 +461,9 @@
 
 // Returns map from lowercase username to AccountUserInfo
 function memberLowercaseUsernameMap(
-  members: $ReadOnlyArray<RelativeMemberInfo>,
+  members: $ReadOnlyArray<
+    LegacyRelativeMemberInfo | MinimallyEncodedRelativeMemberInfo,
+  >,
 ): Map<string, AccountUserInfo> {
   const memberMap = new Map<string, AccountUserInfo>();
   for (const member of members) {
@@ -877,8 +881,9 @@
     return firstLine(threadInfo.name);
   }
 
-  const threadMembers: $ReadOnlyArray<RelativeMemberInfo> =
-    threadInfo.members.filter(memberInfo => memberInfo.role);
+  const threadMembers: $ReadOnlyArray<
+    LegacyRelativeMemberInfo | MinimallyEncodedRelativeMemberInfo,
+  > = threadInfo.members.filter(memberInfo => memberInfo.role);
   const memberEntities: $ReadOnlyArray<UserEntity> = threadMembers.map(member =>
     ET.user({ userInfo: member }),
   );
@@ -1030,7 +1035,11 @@
 // Since we don't have access to all of the ancestor ThreadInfos, we approximate
 // "parent admin" as anybody with CHANGE_ROLE permissions.
 function memberHasAdminPowers(
-  memberInfo: RelativeMemberInfo | MemberInfo | ServerMemberInfo,
+  memberInfo:
+    | LegacyRelativeMemberInfo
+    | MinimallyEncodedRelativeMemberInfo
+    | MemberInfo
+    | ServerMemberInfo,
 ): boolean {
   if (memberInfo.minimallyEncoded) {
     return hasPermission(memberInfo.permissions, threadPermissions.CHANGE_ROLE);
@@ -1511,7 +1520,7 @@
 
 function removeMemberFromThread(
   threadInfo: ThreadInfo,
-  memberInfo: RelativeMemberInfo,
+  memberInfo: LegacyRelativeMemberInfo | MinimallyEncodedRelativeMemberInfo,
   dispatchActionPromise: DispatchActionPromise,
   removeUserFromThreadServerCall: (
     input: RemoveUsersFromThreadInput,
@@ -1529,7 +1538,7 @@
 }
 
 function getAvailableThreadMemberActions(
-  memberInfo: RelativeMemberInfo,
+  memberInfo: LegacyRelativeMemberInfo | MinimallyEncodedRelativeMemberInfo,
   threadInfo: ThreadInfo,
   canEdit: ?boolean = true,
 ): $ReadOnlyArray<'change_role' | 'remove_user'> {
diff --git a/lib/types/thread-types.js b/lib/types/thread-types.js
--- a/lib/types/thread-types.js
+++ b/lib/types/thread-types.js
@@ -17,7 +17,6 @@
 import type {
   MinimallyEncodedMemberInfo,
   RawThreadInfo,
-  MinimallyEncodedRelativeMemberInfo,
   ResolvedThreadInfo,
   MinimallyEncodedRoleInfo,
   ThreadInfo,
@@ -61,10 +60,6 @@
   +isViewer: boolean,
 }>;
 
-export type RelativeMemberInfo =
-  | LegacyRelativeMemberInfo
-  | MinimallyEncodedRelativeMemberInfo;
-
 export type LegacyRoleInfo = {
   +id: string,
   +name: string,
diff --git a/lib/utils/role-utils.js b/lib/utils/role-utils.js
--- a/lib/utils/role-utils.js
+++ b/lib/utils/role-utils.js
@@ -4,13 +4,16 @@
 
 import { useSelector } from './redux-utils.js';
 import { threadInfoSelector } from '../selectors/thread-selectors.js';
-import type { ThreadInfo } from '../types/minimally-encoded-thread-permissions-types.js';
+import type {
+  MinimallyEncodedRelativeMemberInfo,
+  ThreadInfo,
+} from '../types/minimally-encoded-thread-permissions-types.js';
 import {
   configurableCommunityPermissions,
   type ThreadRolePermissionsBlob,
   type UserSurfacedPermission,
 } from '../types/thread-permission-types.js';
-import type { RelativeMemberInfo, RoleInfo } from '../types/thread-types';
+import type { LegacyRelativeMemberInfo, RoleInfo } from '../types/thread-types';
 import { threadTypes } from '../types/thread-types-enum.js';
 
 function constructRoleDeletionMessagePrompt(
@@ -54,7 +57,9 @@
 
 function useRolesFromCommunityThreadInfo(
   threadInfo: ThreadInfo,
-  memberInfos: $ReadOnlyArray<RelativeMemberInfo>,
+  memberInfos: $ReadOnlyArray<
+    LegacyRelativeMemberInfo | MinimallyEncodedRelativeMemberInfo,
+  >,
 ): $ReadOnlyMap<string, ?RoleInfo> {
   // Our in-code system has chat-specific roles, while the
   // user-surfaced system has roles only for communities. We retrieve roles
diff --git a/native/chat/chat-input-bar.react.js b/native/chat/chat-input-bar.react.js
--- a/native/chat/chat-input-bar.react.js
+++ b/native/chat/chat-input-bar.react.js
@@ -73,13 +73,16 @@
   MessageInfo,
   SendEditMessageResponse,
 } from 'lib/types/message-types.js';
-import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
+import type {
+  MinimallyEncodedRelativeMemberInfo,
+  ThreadInfo,
+} from 'lib/types/minimally-encoded-thread-permissions-types.js';
 import type { Dispatch } from 'lib/types/redux-types.js';
 import { threadPermissions } from 'lib/types/thread-permission-types.js';
 import type {
   ChatMentionCandidates,
   ClientThreadJoinRequest,
-  RelativeMemberInfo,
+  LegacyRelativeMemberInfo,
   ThreadJoinPayload,
 } from 'lib/types/thread-types.js';
 import { type UserInfos } from 'lib/types/user-types.js';
@@ -294,7 +297,9 @@
   +dispatchActionPromise: DispatchActionPromise,
   +joinThread: (request: ClientThreadJoinRequest) => Promise<ThreadJoinPayload>,
   +inputState: ?InputState,
-  +userMentionsCandidates: $ReadOnlyArray<RelativeMemberInfo>,
+  +userMentionsCandidates: $ReadOnlyArray<
+    LegacyRelativeMemberInfo | MinimallyEncodedRelativeMemberInfo,
+  >,
   +chatMentionSearchIndex: SentencePrefixSearchIndex,
   +chatMentionCandidates: ChatMentionCandidates,
   +parentThreadInfo: ?ThreadInfo,
diff --git a/native/chat/settings/thread-settings-member-tooltip-modal.react.js b/native/chat/settings/thread-settings-member-tooltip-modal.react.js
--- a/native/chat/settings/thread-settings-member-tooltip-modal.react.js
+++ b/native/chat/settings/thread-settings-member-tooltip-modal.react.js
@@ -5,8 +5,11 @@
 import { useRemoveUsersFromThread } from 'lib/actions/thread-actions.js';
 import { removeMemberFromThread } from 'lib/shared/thread-utils.js';
 import { stringForUser } from 'lib/shared/user-utils.js';
-import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
-import type { RelativeMemberInfo } from 'lib/types/thread-types.js';
+import type {
+  MinimallyEncodedRelativeMemberInfo,
+  ThreadInfo,
+} from 'lib/types/minimally-encoded-thread-permissions-types.js';
+import type { LegacyRelativeMemberInfo } from 'lib/types/thread-types.js';
 import { useDispatchActionPromise } from 'lib/utils/redux-promise-utils.js';
 
 import ThreadSettingsMemberTooltipButton from './thread-settings-member-tooltip-button.react.js';
@@ -22,7 +25,7 @@
 import Alert from '../../utils/alert.js';
 
 export type ThreadSettingsMemberTooltipModalParams = TooltipParams<{
-  +memberInfo: RelativeMemberInfo,
+  +memberInfo: LegacyRelativeMemberInfo | MinimallyEncodedRelativeMemberInfo,
   +threadInfo: ThreadInfo,
 }>;
 
diff --git a/native/chat/settings/thread-settings-member.react.js b/native/chat/settings/thread-settings-member.react.js
--- a/native/chat/settings/thread-settings-member.react.js
+++ b/native/chat/settings/thread-settings-member.react.js
@@ -19,8 +19,11 @@
 import { getAvailableThreadMemberActions } from 'lib/shared/thread-utils.js';
 import { stringForUser } from 'lib/shared/user-utils.js';
 import type { LoadingStatus } from 'lib/types/loading-types.js';
-import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
-import type { RelativeMemberInfo } from 'lib/types/thread-types.js';
+import type {
+  MinimallyEncodedRelativeMemberInfo,
+  ThreadInfo,
+} from 'lib/types/minimally-encoded-thread-permissions-types.js';
+import type { LegacyRelativeMemberInfo } from 'lib/types/thread-types.js';
 import { useRolesFromCommunityThreadInfo } from 'lib/utils/role-utils.js';
 
 import type { ThreadSettingsNavigate } from './thread-settings.react.js';
@@ -87,7 +90,7 @@
 };
 
 type BaseProps = {
-  +memberInfo: RelativeMemberInfo,
+  +memberInfo: LegacyRelativeMemberInfo | MinimallyEncodedRelativeMemberInfo,
   +threadInfo: ThreadInfo,
   +canEdit: boolean,
   +navigate: ThreadSettingsNavigate,
diff --git a/native/chat/settings/thread-settings.react.js b/native/chat/settings/thread-settings.react.js
--- a/native/chat/settings/thread-settings.react.js
+++ b/native/chat/settings/thread-settings.react.js
@@ -34,13 +34,14 @@
 } from 'lib/shared/thread-utils.js';
 import threadWatcher from 'lib/shared/thread-watcher.js';
 import type {
+  MinimallyEncodedRelativeMemberInfo,
   ResolvedThreadInfo,
   ThreadInfo,
 } from 'lib/types/minimally-encoded-thread-permissions-types.js';
 import type { RelationshipButton } from 'lib/types/relationship-types.js';
 import { threadPermissions } from 'lib/types/thread-permission-types.js';
 import { threadTypes } from 'lib/types/thread-types-enum.js';
-import type { RelativeMemberInfo } from 'lib/types/thread-types.js';
+import type { LegacyRelativeMemberInfo } from 'lib/types/thread-types.js';
 import type { UserInfos } from 'lib/types/user-types.js';
 import {
   useResolvedOptionalThreadInfo,
@@ -203,7 +204,9 @@
   | {
       +itemType: 'member',
       +key: string,
-      +memberInfo: RelativeMemberInfo,
+      +memberInfo:
+        | LegacyRelativeMemberInfo
+        | MinimallyEncodedRelativeMemberInfo,
       +threadInfo: ResolvedThreadInfo,
       +canEdit: boolean,
       +navigate: ThreadSettingsNavigate,
@@ -1123,7 +1126,9 @@
 
 const threadMembersChangeIsSaving = (
   state: AppState,
-  threadMembers: $ReadOnlyArray<RelativeMemberInfo>,
+  threadMembers: $ReadOnlyArray<
+    LegacyRelativeMemberInfo | MinimallyEncodedRelativeMemberInfo,
+  >,
 ) => {
   for (const threadMember of threadMembers) {
     const removeUserLoadingStatus = createLoadingStatusSelector(
diff --git a/native/roles/change-roles-screen.react.js b/native/roles/change-roles-screen.react.js
--- a/native/roles/change-roles-screen.react.js
+++ b/native/roles/change-roles-screen.react.js
@@ -12,8 +12,11 @@
 import { otherUsersButNoOtherAdmins } from 'lib/selectors/thread-selectors.js';
 import { roleIsAdminRole } from 'lib/shared/thread-utils.js';
 import type { LoadingStatus } from 'lib/types/loading-types.js';
-import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
-import type { RelativeMemberInfo } from 'lib/types/thread-types.js';
+import type {
+  MinimallyEncodedRelativeMemberInfo,
+  ThreadInfo,
+} from 'lib/types/minimally-encoded-thread-permissions-types.js';
+import type { LegacyRelativeMemberInfo } from 'lib/types/thread-types.js';
 import { values } from 'lib/utils/objects.js';
 
 import ChangeRolesHeaderRightButton from './change-roles-header-right-button.react.js';
@@ -26,7 +29,7 @@
 
 export type ChangeRolesScreenParams = {
   +threadInfo: ThreadInfo,
-  +memberInfo: RelativeMemberInfo,
+  +memberInfo: LegacyRelativeMemberInfo | MinimallyEncodedRelativeMemberInfo,
   +role: ?string,
 };
 
diff --git a/web/input/input-state.js b/web/input/input-state.js
--- a/web/input/input-state.js
+++ b/web/input/input-state.js
@@ -9,10 +9,13 @@
   type MediaType,
 } from 'lib/types/media-types.js';
 import type { RawTextMessageInfo } from 'lib/types/messages/text.js';
-import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
+import type {
+  MinimallyEncodedRelativeMemberInfo,
+  ThreadInfo,
+} from 'lib/types/minimally-encoded-thread-permissions-types.js';
 import type {
   ChatMentionCandidates,
-  RelativeMemberInfo,
+  LegacyRelativeMemberInfo,
 } from 'lib/types/thread-types.js';
 
 export type PendingMultimediaUpload = {
@@ -47,7 +50,9 @@
 export type TypeaheadState = {
   +canBeVisible: boolean,
   +keepUpdatingThreadMembers: boolean,
-  +frozenUserMentionsCandidates: $ReadOnlyArray<RelativeMemberInfo>,
+  +frozenUserMentionsCandidates: $ReadOnlyArray<
+    LegacyRelativeMemberInfo | MinimallyEncodedRelativeMemberInfo,
+  >,
   +frozenChatMentionsCandidates: ChatMentionCandidates,
   +moveChoiceUp: ?() => void,
   +moveChoiceDown: ?() => void,
diff --git a/web/modals/threads/create/steps/subchannel-members-list.react.js b/web/modals/threads/create/steps/subchannel-members-list.react.js
--- a/web/modals/threads/create/steps/subchannel-members-list.react.js
+++ b/web/modals/threads/create/steps/subchannel-members-list.react.js
@@ -4,8 +4,11 @@
 
 import { useENSNames } from 'lib/hooks/ens-cache.js';
 import { stringForUser } from 'lib/shared/user-utils.js';
-import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
-import type { RelativeMemberInfo } from 'lib/types/thread-types.js';
+import type {
+  MinimallyEncodedRelativeMemberInfo,
+  ThreadInfo,
+} from 'lib/types/minimally-encoded-thread-permissions-types.js';
+import type { LegacyRelativeMemberInfo } from 'lib/types/thread-types.js';
 import type { UserListItem } from 'lib/types/user-types.js';
 
 import { useSelector } from '../../../../redux/redux-utils.js';
@@ -40,7 +43,11 @@
   );
 
   const filterOutParentMembersWithENSNames = React.useCallback(
-    (members: $ReadOnlyArray<RelativeMemberInfo>) =>
+    (
+      members: $ReadOnlyArray<
+        LegacyRelativeMemberInfo | MinimallyEncodedRelativeMemberInfo,
+      >,
+    ) =>
       members
         .filter(
           user =>
@@ -61,7 +68,11 @@
   );
 
   const filterOutOtherMembersWithENSNames = React.useCallback(
-    (members: $ReadOnlyArray<RelativeMemberInfo>) =>
+    (
+      members: $ReadOnlyArray<
+        LegacyRelativeMemberInfo | MinimallyEncodedRelativeMemberInfo,
+      >,
+    ) =>
       members
         .filter(
           user =>
diff --git a/web/modals/threads/members/change-member-role-modal.react.js b/web/modals/threads/members/change-member-role-modal.react.js
--- a/web/modals/threads/members/change-member-role-modal.react.js
+++ b/web/modals/threads/members/change-member-role-modal.react.js
@@ -11,8 +11,11 @@
 import SWMansionIcon from 'lib/components/SWMansionIcon.react.js';
 import { otherUsersButNoOtherAdmins } from 'lib/selectors/thread-selectors.js';
 import { roleIsAdminRole } from 'lib/shared/thread-utils.js';
-import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
-import type { RelativeMemberInfo } from 'lib/types/thread-types';
+import type {
+  MinimallyEncodedRelativeMemberInfo,
+  ThreadInfo,
+} from 'lib/types/minimally-encoded-thread-permissions-types.js';
+import type { LegacyRelativeMemberInfo } from 'lib/types/thread-types';
 import { values } from 'lib/utils/objects.js';
 import { useDispatchActionPromise } from 'lib/utils/redux-promise-utils.js';
 
@@ -25,7 +28,7 @@
 import UnsavedChangesModal from '../../unsaved-changes-modal.react.js';
 
 type ChangeMemberRoleModalProps = {
-  +memberInfo: RelativeMemberInfo,
+  +memberInfo: LegacyRelativeMemberInfo | MinimallyEncodedRelativeMemberInfo,
   +threadInfo: ThreadInfo,
 };
 
diff --git a/web/modals/threads/members/member.react.js b/web/modals/threads/members/member.react.js
--- a/web/modals/threads/members/member.react.js
+++ b/web/modals/threads/members/member.react.js
@@ -11,8 +11,11 @@
 } from 'lib/shared/thread-utils.js';
 import { stringForUser } from 'lib/shared/user-utils.js';
 import type { SetState } from 'lib/types/hook-types.js';
-import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
-import type { RelativeMemberInfo } from 'lib/types/thread-types.js';
+import type {
+  MinimallyEncodedRelativeMemberInfo,
+  ThreadInfo,
+} from 'lib/types/minimally-encoded-thread-permissions-types.js';
+import type { LegacyRelativeMemberInfo } from 'lib/types/thread-types.js';
 import { useDispatchActionPromise } from 'lib/utils/redux-promise-utils.js';
 import { useRolesFromCommunityThreadInfo } from 'lib/utils/role-utils.js';
 
@@ -28,7 +31,7 @@
 const commIconComponent = <CommIcon size={18} icon="user-edit" />;
 
 type Props = {
-  +memberInfo: RelativeMemberInfo,
+  +memberInfo: LegacyRelativeMemberInfo | MinimallyEncodedRelativeMemberInfo,
   +threadInfo: ThreadInfo,
   +setOpenMenu: SetState<?string>,
 };
diff --git a/web/modals/threads/members/members-list.react.js b/web/modals/threads/members/members-list.react.js
--- a/web/modals/threads/members/members-list.react.js
+++ b/web/modals/threads/members/members-list.react.js
@@ -7,15 +7,20 @@
 
 import { useENSNames } from 'lib/hooks/ens-cache.js';
 import { stringForUser } from 'lib/shared/user-utils.js';
-import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
-import { type RelativeMemberInfo } from 'lib/types/thread-types.js';
+import type {
+  MinimallyEncodedRelativeMemberInfo,
+  ThreadInfo,
+} from 'lib/types/minimally-encoded-thread-permissions-types.js';
+import type { LegacyRelativeMemberInfo } from 'lib/types/thread-types.js';
 
 import ThreadMember from './member.react.js';
 import css from './members-modal.css';
 
 type Props = {
   +threadInfo: ThreadInfo,
-  +threadMembers: $ReadOnlyArray<RelativeMemberInfo>,
+  +threadMembers: $ReadOnlyArray<
+    LegacyRelativeMemberInfo | MinimallyEncodedRelativeMemberInfo,
+  >,
 };
 
 function ThreadMembersList(props: Props): React.Node {
@@ -40,14 +45,20 @@
         .map(([letter, users]) => {
           const userList = users
             .sort((a, b) => stringForUser(a).localeCompare(stringForUser(b)))
-            .map((user: RelativeMemberInfo) => (
-              <ThreadMember
-                key={user.id}
-                memberInfo={user}
-                threadInfo={threadInfo}
-                setOpenMenu={setOpenMenu}
-              />
-            ));
+            .map(
+              (
+                user:
+                  | LegacyRelativeMemberInfo
+                  | MinimallyEncodedRelativeMemberInfo,
+              ) => (
+                <ThreadMember
+                  key={user.id}
+                  memberInfo={user}
+                  threadInfo={threadInfo}
+                  setOpenMenu={setOpenMenu}
+                />
+              ),
+            );
           const letterHeader = (
             <h5 className={css.memberletterHeader} key={letter}>
               {letter.toUpperCase()}
diff --git a/web/modals/threads/members/members-modal.react.js b/web/modals/threads/members/members-modal.react.js
--- a/web/modals/threads/members/members-modal.react.js
+++ b/web/modals/threads/members/members-modal.react.js
@@ -9,8 +9,9 @@
   roleIsAdminRole,
   threadHasPermission,
 } from 'lib/shared/thread-utils.js';
+import type { MinimallyEncodedRelativeMemberInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
 import { threadPermissions } from 'lib/types/thread-permission-types.js';
-import { type RelativeMemberInfo } from 'lib/types/thread-types.js';
+import type { LegacyRelativeMemberInfo } from 'lib/types/thread-types.js';
 import { useRolesFromCommunityThreadInfo } from 'lib/utils/role-utils.js';
 
 import { AddMembersModal } from './add-members-modal.react.js';
@@ -55,8 +56,9 @@
   const allMembers = React.useMemo(
     () =>
       threadMembersNotFiltered.filter(
-        (member: RelativeMemberInfo) =>
-          searchText.length === 0 || userIDs.includes(member.id),
+        (
+          member: LegacyRelativeMemberInfo | MinimallyEncodedRelativeMemberInfo,
+        ) => searchText.length === 0 || userIDs.includes(member.id),
       ),
     [searchText.length, threadMembersNotFiltered, userIDs],
   );
@@ -64,8 +66,10 @@
   const roles = useRolesFromCommunityThreadInfo(threadInfo, allMembers);
   const adminMembers = React.useMemo(
     () =>
-      allMembers.filter((member: RelativeMemberInfo) =>
-        roleIsAdminRole(roles.get(member.id)),
+      allMembers.filter(
+        (
+          member: LegacyRelativeMemberInfo | MinimallyEncodedRelativeMemberInfo,
+        ) => roleIsAdminRole(roles.get(member.id)),
       ),
     [allMembers, roles],
   );