I encountered the error today when using RealityComposer with Xcode version 14.0.1. Instead, RealityComposer on the iPad app was able to output usdz, so I am using that.

Sorry, when I did complex arrangement of objects (grouping, use of many objects), I have also faced the problem on the iPad app.

Depending on the assets used, sometimes single placement was not even possible. It seems that this is not only a problem of placement complexity.

Using Xcode14 and iOS version is 16.0