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I'm working on this those days, and I do find one way to fix this problem. This is maybe a pyassimp bug, check out if you're using pyassimp 4.1.4 or not. If so, use sudo -H pip uninstall pyassimp and sudo -H pip install pyassimp==4.1.3 or 3.3 is ok. I tried this, and my mesh import works well. Hope this answer may be helpful

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