Thanks @opticron and @amar for the detailled answers.
The python version is most likely the problem. OpenSUSE unfortunately is really bad at providing up to date versions of some packages, while others are really up to date. A plain python is still Python 3.6.15. They provide a Python 3.11 and 3.12. But it’s only available via explicit python3.11 and python3.12 commands. Seems that I now need a python venv even just to build the tools due to that.
Thank you again.
Best regards
Christian