Rotation of bones of robot.usdz in Reality view

Hi guys,

I thought I make a visionOS test app with the Apple's native robot.usdz file. My plan was to rotate limbs of the robot programatically, but while I can see the bones in previous Xcode versions and in Blender, somehow I can not reach them in Xcode 15.3 or Reality Composer Pro. Has anyone any experience with that?