Starting with Xcode Beta 4+, any ModelEntity I load from usdz that contain a skeletal pose has no pins. The pins used to be accessible from a ModelEntity so you could use alignment with other pins.
Per the documentation, any ModelEntity with a skeletal pose should have pins that are automatically generated and contained on the entity.pins object itself.
https://developer.apple.com/documentation/RealityKit/Entity/pins
Is this a bug with the later Xcode betas or is the documentation wrong?