message splitting gone haywire

[Eric Abrahamsen <eric@ericabrahamsen.net>]

I've been keeping up to date with git gnus (I'm on Ubuntu's 23.2 emacs),
and a week or so ago, message splitting started going haywire. There's
not much of a discernible pattern: messages are just going in the wrong
groups.

I'm using the registry, with gnus-registry-split-fancy-with-parent. Also
BBDB 3.0, with bbdb/gnus-split method. Then some plain old
nnmail-split-fancy regexps. None of these seems obviously the culprit.
Some messages that should be split into their own groups by
nnmail-split-fancy go into those groups half the time, into mail.misc
the other half (they used to all go into the proper group, they're
automated messages and neither the message nor the regexp has changed).
A message I just sent from one of my email addresses to another of my
email addresses went into a group that's only referenced by a
gnus.private line in a BBDB record (not my own record, needless to say).

Like I said, no one thing seems to be the clear source of the problem.
Has anyone else seen anything like this over the past few weeks? I can
paste the relevant part of my config, if necessary.

Thanks,
Eric