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Is it a free model? Is it available for download? So I can test too.

I can't speak for the original poster, but I was able to replicate this while trying to test mouth tracking using this model:

https://hub.vroid.com/en/characters/1180986468372086018/models/11842473353483486...

I have updated an app so it doesn't crash on this model, but it still have some problems with physics bones, which I will try to fix later.