I don't even know how to name it

I can’t reference a global group for some reason. Hero object is also global. Problem is not cosmetic, and ruins the game. I can not overcome this

Could it be a capitalization issue? All objects and groups are case-sensitive.

No, it not the case. Spelling is perfect, and every object in group in lowercase

What do you see in the action editor?

All quiet in action editor

I think Davy correctly answered you by pointing out that if you’re using Physics 3D collisions, the collision checks are handled by the 3D Physics Engine, so all objects involved need to be part of the Physics 3D system.

…i guess..bcs the same apply in 2D for the Physics2D behaviour..

Still not the case, BUT, I found the solution.
Turns out I had unglobal objects in global group. Deleting those objects unfreaks editor, and everything works fine.
For some reason that was not a problem in earlier versions of the engine

Interesting, thanks for sharing, there is definitely something to be fixed.