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
@@ -79,21 +79,22 @@
   threadTypeIsCommunityRoot,
   assertThreadType,
 } from '../types/thread-types-enum.js';
-import {
-  type LegacyRawThreadInfo,
-  type LegacyThreadInfo,
-  type MemberInfo,
-  type ServerThreadInfo,
-  type ThreadCurrentUserInfo,
-  type RoleInfo,
-  type ServerMemberInfo,
-  type ClientNewThreadRequest,
-  type NewThreadResult,
-  type ChangeThreadSettingsPayload,
-  type UserProfileThreadInfo,
-  type RelativeMemberInfo,
-  type RawThreadInfo,
-  type ThreadInfo,
+import type {
+  LegacyRawThreadInfo,
+  LegacyThreadInfo,
+  MemberInfo,
+  ServerThreadInfo,
+  ThreadCurrentUserInfo,
+  RoleInfo,
+  ServerMemberInfo,
+  ClientNewThreadRequest,
+  NewThreadResult,
+  ChangeThreadSettingsPayload,
+  UserProfileThreadInfo,
+  RelativeMemberInfo,
+  RawThreadInfo,
+  ThreadInfo,
+  RawThreadInfos,
 } from '../types/thread-types.js';
 import { updateTypes } from '../types/update-types-enum.js';
 import { type ClientUpdateInfo } from '../types/update-types.js';
@@ -1754,6 +1755,20 @@
   ]);
 }
 
+function assertAllThreadInfosAreLegacy(rawThreadInfos: RawThreadInfos): {
+  [id: string]: LegacyRawThreadInfo,
+} {
+  return Object.fromEntries(
+    Object.entries(rawThreadInfos).map(([id, rawThreadInfo]) => {
+      invariant(
+        !rawThreadInfo.minimallyEncoded,
+        `rawThreadInfos shouldn't be minimallyEncoded`,
+      );
+      return [id, rawThreadInfo];
+    }),
+  );
+}
+
 export {
   threadHasPermission,
   viewerIsMember,
@@ -1820,4 +1835,5 @@
   useRoleUserSurfacedPermissions,
   getThreadsToDeleteText,
   useUserProfileThreadInfo,
+  assertAllThreadInfosAreLegacy,
 };
diff --git a/native/redux/persist.js b/native/redux/persist.js
--- a/native/redux/persist.js
+++ b/native/redux/persist.js
@@ -39,6 +39,7 @@
 import {
   getContainingThreadID,
   getCommunity,
+  assertAllThreadInfosAreLegacy,
 } from 'lib/shared/thread-utils.js';
 import {
   DEPRECATED_unshimMessageStore,
@@ -73,6 +74,7 @@
 import type {
   ClientDBThreadInfo,
   LegacyRawThreadInfo,
+  RawThreadInfo,
 } from 'lib/types/thread-types.js';
 import {
   translateClientDBMessageInfoToRawMessageInfo,
@@ -379,7 +381,7 @@
       return state;
     }
 
-    const threadInfos: { [string]: LegacyRawThreadInfo } = {};
+    const threadInfos: { [string]: RawThreadInfo } = {};
     const stack = [...rootIDs];
     while (stack.length > 0) {
       const threadID = stack.shift();
@@ -403,9 +405,12 @@
     return { ...state, threadStore: { ...state.threadStore, threadInfos } };
   },
   [29]: (state: AppState) => {
-    const updatedThreadInfos = migrateThreadStoreForEditThreadPermissions(
-      state.threadStore.threadInfos,
-    );
+    const legacyRawThreadInfos: {
+      +[id: string]: LegacyRawThreadInfo,
+    } = assertAllThreadInfosAreLegacy(state.threadStore.threadInfos);
+
+    const updatedThreadInfos =
+      migrateThreadStoreForEditThreadPermissions(legacyRawThreadInfos);
 
     return {
       ...state,