Fix regression around haveRendererForEvent for hidden events (#8379)

src/components/structures/MessagePanel.tsx

@@ -452,14 +452,6 @@ export default class MessagePanel extends React.Component<IProps, IState> {
         }
     }
 
-    /* check the scroll state and send out pagination requests if necessary.
-     */
-    public checkFillState(): void {
-        if (this.scrollPanel.current) {
-            this.scrollPanel.current.checkFillState();
-        }
-    }
-
     private isUnmounting = (): boolean => {
         return !this.isMounted;
     };

src/events/EventTileFactory.tsx

@@ -393,6 +393,8 @@ export function haveRendererForEvent(mxEvent: MatrixEvent, showHiddenEvents: boo
         return hasText(mxEvent, showHiddenEvents);
     } else if (handler === STATE_EVENT_TILE_TYPES[EventType.RoomCreate]) {
         return Boolean(mxEvent.getContent()['predecessor']);
+    } else if (handler === JSONEventFactory) {
+        return false;
     } else {
         return true;
     }