diff --git a/lib/hooks/user-identities-hooks.js b/lib/hooks/user-identities-hooks.js
--- a/lib/hooks/user-identities-hooks.js
+++ b/lib/hooks/user-identities-hooks.js
@@ -3,7 +3,10 @@
 import * as React from 'react';
 
 import { useFindUserIdentities } from '../actions/find-user-identities-actions.js';
-import { userHasDeviceList } from '../shared/thread-utils.js';
+import {
+  userHasDeviceList,
+  useHasThickThreadWithUser,
+} from '../shared/thread-utils.js';
 import { useSelector } from '../utils/redux-utils.js';
 
 function useUsersSupportThickThreads(): (
@@ -11,6 +14,7 @@
 ) => Promise<$ReadOnlySet<string>> {
   const findUserIdentities = useFindUserIdentities();
   const auxUserInfos = useSelector(state => state.auxUserStore.auxUserInfos);
+  const hasThickThreadWithUser = useHasThickThreadWithUser();
 
   return React.useCallback(
     async (userIDs: $ReadOnlyArray<string>) => {
@@ -18,7 +22,10 @@
 
       const usersNeedingFetch = [];
       for (const userID of userIDs) {
-        if (userHasDeviceList(userID, auxUserInfos)) {
+        if (
+          userHasDeviceList(userID, auxUserInfos) ||
+          hasThickThreadWithUser(userID)
+        ) {
           usersSupportingThickThreads.add(userID);
         } else {
           usersNeedingFetch.push(userID);
@@ -34,7 +41,7 @@
       }
       return usersSupportingThickThreads;
     },
-    [auxUserInfos, findUserIdentities],
+    [auxUserInfos, findUserIdentities, hasThickThreadWithUser],
   );
 }
 
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
@@ -37,6 +37,7 @@
   pendingToRealizedThreadIDsSelector,
   threadInfosSelectorForThreadType,
   onScreenThreadInfos,
+  thickRawThreadInfosSelector,
 } from '../selectors/thread-selectors.js';
 import {
   getRelativeMemberInfos,
@@ -1895,6 +1896,19 @@
   );
 }
 
+function useHasThickThreadWithUser(): (userID: string) => boolean {
+  const thickThreadInfos = useSelector(thickRawThreadInfosSelector);
+
+  return React.useCallback(
+    (userID: string): boolean => {
+      return values(thickThreadInfos).some(thread => {
+        return userIsMember(thread, userID);
+      });
+    },
+    [thickThreadInfos],
+  );
+}
+
 export {
   threadHasPermission,
   useCommunityRootMembersToRole,
@@ -1965,4 +1979,5 @@
   deviceListIsNonEmpty,
   deviceListCanBeRequestedForUser,
   expectedAccountDeletionUpdateTimeout,
+  useHasThickThreadWithUser,
 };