EbonJaeger that explains the libsoup version conflict in his initial output:
"rhythmbox: libsoup version mismatch causes it to segfault on open. Rhythmbox uses libsoup 2, but grilo (a dependency of Rhythmbox) uses libsoup 3."

    OK, found, for me it's rhythmbox-alternative-toolbar the responsible. Without it, rhythmbox runs.

      olivir Actually we updated grilo and grilo-plugins to use libsoup 2 instead of libsoup 3.
      rhythmbox-alternative-toolbar doesn't depend at all on libsoup. So I think if you have done full update then try to install again rhythmbox-alternative-toolbar, and check if the issue appears again.

        Oh yes, it works with a reinstall of rhythmbox-alternative-toolbar ! 🎊🙏