I have now tested it again with my colleague (without the “-dx11” parameter). He has the following specifications:
Intel i7 9700KF
AMD RX 580 8GB
80GB RAM
Win 10 21H2
It occured there as well, but not constantly(rarely) and so it can also be more of a Windows 11 or GPU(NVidia) Bug.
EDIT:
With -dx11 parameter it is fixed as well.