I wanted to let you know that switching to GDM as the display manager resolves the login/session issue for me—everything works correctly now with GDM and KDE plasma 6.3.6. On SDDM it was still unstable even without pam-u2f, as new users the first time they entered in wayland session were working fine. And the second time the same issue appeared again. GDM feels more stable in my installation.
As requested, I have already shared my previous PAM.d configuration files. For now, I’m reinstalling my system to have a clean and working OS. However, I plan to try to reproduce the bug in a VM if possible after official debian 13 release, and will report back if I can confirm it. I hope this information is helpful for debugging. Thank you for your assistance. Arthur
