BUG: falling into void when starting backstab with double daggers

GPU 4080s
CPU I9-12900k
the backstab is just triggered then the screen went black and the loading icon right bottom shown. few seconds later, my character falling into void.
It’s happened several times, and only with equipping double dagger.

Uff that could be anything i guess :face_with_diagonal_mouth:
Can you make a screenshot of the location you were?