Did you ever get find a solution? I'm seeing the same thing. I was loading USDZ files dynamically via ModelEntity.loadModel(named: String) calls but started moving all to Reality Composer Pro for faster loading. After successfully moving about 80 percent of the models, I started seeing the same error. My different models were being loaded for different purposes and in my case it's a specific use case / type that is creating the error. I have removed all of the original loading calls and still seeing the error. This lead me to think it is something that I am doing with the model after it is loaded that differentiates these from the rest, but I am having a difficult time tracking it down. I was really hoping to come back to this thread to find your solution for a hint pointing me in the right direction.