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
@@ -1709,7 +1709,7 @@
     });
 
     return roleNamesToMemberCount;
-  }, [threadInfo]);
+  }, [threadInfo.members, threadInfo.roles]);
 }
 
 function useRoleNamesToSpecialRole(threadInfo: ThreadInfo): {
@@ -1769,7 +1769,7 @@
     });
 
     return roleNamesToPermissions;
-  }, [threadInfo]);
+  }, [threadInfo.roles]);
 }
 
 function communityOrThreadNoun(threadInfo: RawThreadInfo | ThreadInfo): string {