Call 'clearMessages'

src/headless/plugins/muc/muc.js

@@ -736,7 +736,7 @@ const ChatRoomMixin = {
     async leave (exit_msg) {
         this.features.destroy();
         this.occupants.clearStore();
-        api.settings.get('muc_clear_messages_on_leave') && this.messages.clearStore();
+        api.settings.get('muc_clear_messages_on_leave') && this.clearMessages();
 
         const disco_entity = _converse.disco_entities?.get(this.get('jid'));
         if (disco_entity) {