'ModuleNotFoundError: No module named '_usd'' when importing USD

So, I'm using some small python script that imports from pxr import Usd, Sdf, UsdGeom, Kind which used to work fine a few months ago. I got the USD tools from https://developer.apple.com/augmented-reality/tools/ and always had to run it in a Rosetta-Terminal (plus making sure the USD tools are in PATH and PYTHONPATH) but it worked.

Now, whatever I do I always get

  File "create_scene.py", line 2, in <module>

    from pxr import Usd, Sdf, UsdGeom, Kind

  File "/Applications/usdpython/USD/lib/python/pxr/Usd/__init__.py", line 24, in <module>

    import _usd
ModuleNotFoundError: No module named '_usd'

Does anyone have any clues what this _usd is about?