I wish to retract the earlier bug report. First, I misidentified the kernel update as 100, but in fact it was 101, not 100 (which was the previous version), and second, I just retested and it works fine.
I don't know what was causing this, but I can state that it did repeatedly not work on the new kernel (which, again, is actually linux-image-6.12.101+deb13-amd64) after multiple reboots. However, it is now working. Sorry for the confusion!

