fix

client/src/components/Level.tsx

@@ -115,6 +115,7 @@ function useLevelEditor(worldId: string, levelId: number, codeviewRef, infoviewR
     setInfoProvider(infoProvider)
     setInfoviewApi(infoviewApi)
 
+    return () => { editor.setModel(null); infoProvider.dispose(); }
   }, [])
 
   // Create model when level changes