I believe this issue was fixed a few days ago. However, the fix has not been adopted in the Kali Linux native repositories.
The issue stems from a Python 3.14 compatibility bug in ospd-openvas/OSPd multiprocessing due to a change in Python 3.14/Linux, where multiprocessing now defaults to forkserver instead of fork. forkserver requires the Process target to be pickleable.
I suggest submitting a bug report to the Kali Linux Bug Tracker to remediate the package conflict.