diff --git a/lib/shared/dm-ops/create-sidebar-spec.js b/lib/shared/dm-ops/create-sidebar-spec.js
index 078ecd3ec..52bd287fe 100644
--- a/lib/shared/dm-ops/create-sidebar-spec.js
+++ b/lib/shared/dm-ops/create-sidebar-spec.js
@@ -1,108 +1,108 @@
 // @flow
 
 import uuid from 'uuid';
 
 import { createThickRawThreadInfo } from './create-thread-spec.js';
 import type {
   DMOperationSpec,
   ProcessDMOperationUtilities,
 } from './dm-op-spec.js';
 import { isInvalidSidebarSource } from '../../shared/message-utils.js';
 import type { DMCreateSidebarOperation } from '../../types/dm-ops.js';
 import { messageTypes } from '../../types/message-types-enum.js';
 import {
   type RawMessageInfo,
   messageTruncationStatus,
 } from '../../types/message-types.js';
 import { threadTypes } from '../../types/thread-types-enum.js';
 import { updateTypes } from '../../types/update-types-enum.js';
 
 const createSidebarSpec: DMOperationSpec<DMCreateSidebarOperation> =
   Object.freeze({
     processDMOperation: async (
       dmOperation: DMCreateSidebarOperation,
       viewerID: string,
       utilities: ProcessDMOperationUtilities,
     ) => {
       const {
         threadID,
         creatorID,
         time,
         parentThreadID,
         memberIDs,
         sourceMessageID,
         roleID,
         newSidebarSourceMessageID,
         newCreateSidebarMessageID,
       } = dmOperation;
       const allMemberIDs = [creatorID, ...memberIDs];
 
       const rawThreadInfo = createThickRawThreadInfo({
         threadID,
         threadType: threadTypes.THICK_SIDEBAR,
         creationTime: time,
         parentThreadID,
         allMemberIDs,
         roleID,
         creatorID,
         viewerID,
       });
 
       rawThreadInfo.sourceMessageID = sourceMessageID;
       rawThreadInfo.containingThreadID = parentThreadID;
 
       const sourceMessage = await utilities.fetchMessage(sourceMessageID);
       if (!sourceMessage) {
         throw new Error(
           `could not find sourceMessage ${sourceMessageID}... probably ` +
             'joined thick thread ${parentThreadID} after its creation',
         );
       }
       if (isInvalidSidebarSource(sourceMessage)) {
         throw new Error(
           `sourceMessage ${sourceMessageID} is an invalid sidebar source`,
         );
       }
 
       const rawMessageInfos: Array<RawMessageInfo> = [
         {
           type: messageTypes.SIDEBAR_SOURCE,
           id: newSidebarSourceMessageID,
           threadID,
           creatorID,
           time,
           sourceMessage,
         },
         {
           type: messageTypes.CREATE_SIDEBAR,
           id: newCreateSidebarMessageID,
           threadID,
           creatorID,
           time: time + 1,
           sourceMessageAuthorID: sourceMessage.creatorID,
           initialThreadState: {
             parentThreadID,
             color: rawThreadInfo.color,
             memberIDs: allMemberIDs,
           },
         },
       ];
 
       const threadJoinUpdateInfo = {
         type: updateTypes.JOIN_THREAD,
         id: uuid.v4(),
         time,
         threadInfo: rawThreadInfo,
         rawMessageInfos,
-        truncationStatus: messageTruncationStatus.UNCHANGED,
+        truncationStatus: messageTruncationStatus.EXHAUSTIVE,
         rawEntryInfos: [],
       };
 
       return {
         rawMessageInfos: [], // included in updateInfos below
         updateInfos: [threadJoinUpdateInfo],
       };
     },
   });
 
 export { createSidebarSpec };
diff --git a/lib/shared/dm-ops/create-thread-spec.js b/lib/shared/dm-ops/create-thread-spec.js
index 57026657a..47dea4fb5 100644
--- a/lib/shared/dm-ops/create-thread-spec.js
+++ b/lib/shared/dm-ops/create-thread-spec.js
@@ -1,162 +1,162 @@
 // @flow
 
 import uuid from 'uuid';
 
 import type { DMOperationSpec } from './dm-op-spec.js';
 import { specialRoles } from '../../permissions/special-roles.js';
 import {
   getAllThreadPermissions,
   makePermissionsBlob,
   getThickThreadRolePermissionsBlob,
 } from '../../permissions/thread-permissions.js';
 import { generatePendingThreadColor } from '../../shared/color-utils.js';
 import type { DMCreateThreadOperation } from '../../types/dm-ops.js';
 import { messageTypes } from '../../types/message-types-enum.js';
 import {
   type RawMessageInfo,
   messageTruncationStatus,
 } from '../../types/message-types.js';
 import {
   type ThickRawThreadInfo,
   type RoleInfo,
   minimallyEncodeMemberInfo,
   minimallyEncodeRoleInfo,
   minimallyEncodeThreadCurrentUserInfo,
 } from '../../types/minimally-encoded-thread-permissions-types.js';
 import { joinThreadSubscription } from '../../types/subscription-types.js';
 import type { ThickThreadType } from '../../types/thread-types-enum.js';
 import type { ThickMemberInfo } from '../../types/thread-types.js';
 import { updateTypes } from '../../types/update-types-enum.js';
 
 type CreateThickRawThreadInfoInput = {
   +threadID: string,
   +threadType: ThickThreadType,
   +creationTime: number,
   +parentThreadID?: ?string,
   +allMemberIDs: $ReadOnlyArray<string>,
   +roleID: string,
   +creatorID: string,
   +viewerID: string,
 };
 type MutableThickRawThreadInfo = { ...ThickRawThreadInfo };
 function createThickRawThreadInfo(
   input: CreateThickRawThreadInfoInput,
 ): MutableThickRawThreadInfo {
   const {
     threadID,
     threadType,
     creationTime,
     parentThreadID,
     allMemberIDs,
     roleID,
     creatorID,
     viewerID,
   } = input;
 
   const color = generatePendingThreadColor(allMemberIDs);
 
   const rolePermissions = getThickThreadRolePermissionsBlob(threadType);
   const membershipPermissions = getAllThreadPermissions(
     makePermissionsBlob(rolePermissions, null, threadID, threadType),
     threadID,
   );
   const role: RoleInfo = {
     ...minimallyEncodeRoleInfo({
       id: roleID,
       name: 'Members',
       permissions: rolePermissions,
       isDefault: true,
     }),
     specialRole: specialRoles.DEFAULT_ROLE,
   };
 
   return {
     thick: true,
     minimallyEncoded: true,
     id: threadID,
     type: threadType,
     color,
     creationTime,
     parentThreadID,
     members: allMemberIDs.map(memberID =>
       minimallyEncodeMemberInfo<ThickMemberInfo>({
         id: memberID,
         role: role.id,
         permissions: membershipPermissions,
         isSender: memberID === viewerID,
         subscription: joinThreadSubscription,
       }),
     ),
     roles: {
       [role.id]: role,
     },
     currentUser: minimallyEncodeThreadCurrentUserInfo({
       role: role.id,
       permissions: membershipPermissions,
       subscription: joinThreadSubscription,
       unread: creatorID !== viewerID,
     }),
     repliesCount: 0,
   };
 }
 
 const createThreadSpec: DMOperationSpec<DMCreateThreadOperation> =
   Object.freeze({
     processDMOperation: async (
       dmOperation: DMCreateThreadOperation,
       viewerID: string,
     ) => {
       const {
         threadID,
         creatorID,
         time,
         threadType,
         memberIDs,
         roleID,
         newMessageID,
       } = dmOperation;
       const allMemberIDs = [creatorID, ...memberIDs];
 
       const rawThreadInfo = createThickRawThreadInfo({
         threadID,
         threadType,
         creationTime: time,
         allMemberIDs,
         roleID,
         creatorID,
         viewerID,
       });
 
       const rawMessageInfos: Array<RawMessageInfo> = [
         {
           type: messageTypes.CREATE_THREAD,
           id: newMessageID,
           threadID,
           creatorID,
           time,
           initialThreadState: {
             type: threadType,
             color: rawThreadInfo.color,
             memberIDs: allMemberIDs,
           },
         },
       ];
 
       const threadJoinUpdateInfo = {
         type: updateTypes.JOIN_THREAD,
         id: uuid.v4(),
         time,
         threadInfo: rawThreadInfo,
         rawMessageInfos,
-        truncationStatus: messageTruncationStatus.UNCHANGED,
+        truncationStatus: messageTruncationStatus.EXHAUSTIVE,
         rawEntryInfos: [],
       };
 
       return {
         rawMessageInfos: [], // included in updateInfos below
         updateInfos: [threadJoinUpdateInfo],
       };
     },
   });
 
 export { createThickRawThreadInfo, createThreadSpec };