After updating to the latest tumbleweed snapshot, the boot prompt used to decrypt my LUKS root partition has switched to QWERTY, which is not my normal keyboard layout and thus makes it harder to type the password.

The following log in journalctl seems like the most likely explanation...

juin 26 22:59:31 silent-graloufotron systemd-vconsole-setup[682]: cannot open include file azerty-layout
juin 26 22:59:31 silent-graloufotron systemd-vconsole-setup[682]: syntax error, unexpected ERROR
juin 26 22:59:31 silent-graloufotron systemd-vconsole-setup[680]: /usr/bin/loadkeys failed with exit status 1.

...and indeed, if I rollback to the previous snapper snapshot and install everything but the dracut update (this still includes a minor kernel update and thus an initrd rebuild), everything is fine. So clearly the dracut update is somehow involved in this.

It looks like somehow, after the dracut update, the initrd does not feature the azerty-layout keymap anymore. There might be more initrd breakage that I cannot see.