Debian's systemd maintainer decided he had enough of upstream's BS.
Upstream bug report below:
Not even Pottering is sure what is going on:
But it seems udev's rule broke the custom naming.Not sure what the right approach here is
I hope everything ends well, we don't need more systemd controversy now that Buster's full freeze is near.
EDIT: While this may seem too abrupt, we know systemd is a dynamic mess that keeps changing rules. I can only guess how many times Michael had to jump through the hoops just to keep compatibility over different archs and use-cases in Debian. This might be the straw that broke the camels back, as people are already noticing.