Can't place Physics box collider on my apprentice robot

Bugs
1

Hey Babylon.js friends. Can someone please help me? I can’t for some reason place or use a physics imposter/box collider on my robot that is floating. I’m trying to stop my apprentice robot from falling through the floor but he can’t because I can’t place a physics collider on him. Would anyone be able to assist me?

Playground:

2

I did a quick check and same with previous forum post, you have to unparent the mesh (.parent = null)
and after some log, the mesh is not newMeshesApprentice[0] but newMeshesApprentice[3].