ignore public group on preprocessGroupMessage

ts/receiver/groups.ts

@@ -37,6 +37,11 @@ export async function preprocessGroupMessage(
     conversationId,
     'group'
   );
+
+  if (conversation.isPublic()) {
+    // window.console.log('No need to preprocess public group chat messages');
+    return;
+  }
   const GROUP_TYPES = SignalService.GroupContext.Type;
 
   if (shouldIgnoreBlockedGroup(group, source)) {