Ok, at this point I guess it's best to involve upstream. Would you mind filing an upstream bug report at https://github.com/systemd/system/issues mentionting that a daemon-reload triggers an assert in manager_unref_uid_internal() and attaching your backtrace.
Thanks, Michael -- Why is it that all of the instruments seeking intelligent life in the universe are pointed away from Earth?
signature.asc
Description: OpenPGP digital signature