crypttab seems to not been active

After I upgraded from Linux Mint 21.1 to 21.2 the newest initrd stopped working. The older one works fine. Regenerating the initrd doesn't help. On startup with the newest initrd the error tells that the UUID of my decrypted Rootdrive does not exist, so I am guessing that the crypttab doesn't get used. I checked the crypttab that hasn't changed.