Thank you! You helped me find the solution. I'll explain it better in my next answer.

Hey, Michael! Thanks for the fast response! Indeed, the Entity(named:in) works with the USDZs correctly. In this case, I don't need to use the ModelEntity constructor, but it definitely may be a good use case for other apps. Anyway this information could be better documented and the constructor typing shouldn't allow the use of the (named:in) signature with ModelEntity, if the in parameter must always be nil. However, the original problem is described here. Can you help me, please?

I couldn't find this "Target Membership" related to any package file, even when clicking in the USDZ file. Can you please be more specific, @Hayyim ? Thanks!