With the official Gentoo Calibre installation, 7.17. Calibre whole crashes after running the plugin also with EPUBCheck. Editor plugins work fine.
It also crashes the other Calibre official
I can't see the plugin window now, so something was updated:
[42896.196303] traps: Thread-6 (do_ch[1058709] general protection fault ip:7f9f4d1d08d0 sp:7fff0578d790 error:0 in libQt6Widgets.so.6[1d08d0,7f9f4d16e000+457000]