diff --git a/lib/reducers/message-reducer.js b/lib/reducers/message-reducer.js
--- a/lib/reducers/message-reducer.js
+++ b/lib/reducers/message-reducer.js
@@ -104,7 +104,7 @@
   stateSyncPayloadTypes,
 } from '../types/socket-types.js';
 import { threadPermissions } from '../types/thread-permission-types.js';
-import { threadTypeIsThick } from '../types/thread-types-enum.js';
+import { threadTypes, threadTypeIsThick } from '../types/thread-types-enum.js';
 import type {
   LegacyRawThreadInfo,
   RawThreadInfos,
@@ -143,7 +143,9 @@
     threadIsPending(threadID) ||
     (threadInfo &&
       threadHasPermission(threadInfo, threadPermissions.VISIBLE) &&
-      (threadInChatList(threadInfo) || watchedIDs.includes(threadID)))
+      (threadInChatList(threadInfo) ||
+        watchedIDs.includes(threadID) ||
+        threadInfo.type === threadTypes.THICK_SIDEBAR))
   );
 }