AR marker detection doesn't work when i change scene and go back to AR

I start in a NON AR scene, then go to an AR scene, everything works OK, I exit the AR scene to another scene, then when I come back to the AR scene, the UI, camera, everything works, but marker detection doesn’t it does. Can someone help me? Here is the link to my example project

Additive Loading Scenes - OK | Editor (

Looks like the original project didn’t properly unregister a global app event that was used when the tracking was initialised.

See changes to playcanvas-ar.js here

Fixed fork:

Now it works correctly, as usual, thanks a lot for your help.