diff --git a/lib/shared/message-utils.js b/lib/shared/message-utils.js
--- a/lib/shared/message-utils.js
+++ b/lib/shared/message-utils.js
@@ -659,10 +659,11 @@
   message: RawMessageInfo | MessageInfo,
 ): boolean %checks {
   return (
-    message.type === messageTypes.REACTION ||
-    message.type === messageTypes.EDIT_MESSAGE ||
-    message.type === messageTypes.SIDEBAR_SOURCE ||
-    message.type === messageTypes.TOGGLE_PIN
+    (message.type === messageTypes.REACTION ||
+      message.type === messageTypes.EDIT_MESSAGE ||
+      message.type === messageTypes.SIDEBAR_SOURCE ||
+      message.type === messageTypes.TOGGLE_PIN) &&
+    !messageSpecs[message.type].canBeSidebarSource
   );
 }