Comment 17 for bug 1861941

So, this looks like the bug to me:

Apr 21 14:15:43 ubuntu-focal systemd-udevd[1916]: bcache0: /usr/lib/udev/rules.d/60-persistent-storage.rules:112 LINK 'disk/by-uuid/30b28bee-6a1e-423d-9d53-32c78ba5454a'
Apr 21 14:15:43 ubuntu-focal systemd-udevd[1916]: bcache0: Updating old name, '/dev/bcache/by-uuid/1522715e-a390-40db-8d47-06fb728014e5' no longer belonging to '/devices/virtual/block/bcache0'
Apr 21 14:15:43 ubuntu-focal systemd-udevd[1916]: bcache0: No reference left, removing '/dev/bcache/by-uuid/1522715e-a390-40db-8d47-06fb728014e5'
Apr 21 14:15:43 ubuntu-focal systemd-udevd[1916]: bcache0: Handling device node '/dev/bcache0', devnum=b251:0

In Focal, the second event is valid, but 60-persistent-storage.rules has no rules that touch /dev/bcache/by-uuid; they don't even use the same ENV value ... so why would the by-uuid symlink rule in 60-persistent-storage.rules remove a link it doesn't have a rule for?