Add Behaviour Error

I came back to GDevelop a few month ago. Started a few projects and after a few weeks I cannot add any behaviors to my GameObjects anymore. It is hard to say what causes it, but it happened to me repeatedly over multiple different projects over the past few months.
The bug doesn’t come up initially - only after a while.

  • I am working on the cloud/browser version of the engine
  • The only fix I managed was to open my project via the mobile application. There I could add my behavior to the object, switch back to the browser application on my desktop and use the behavior in my code.
  • Occasionally it works again. Not tied to a restart/update.
  • Adding behaviors/extensions/functions via the condition/action menue works perfectly fine. It is only iside the Object-Edit-AddBehaviour panel that I get the following error:

If u make a new empty project, with one object can u still not add behaviours?