At Commons there is:
("otrs-member" in global_user_groups)
as part of abuse filter 69, which appears not to work any more since around today, 24 Sep 2020.
This causes additional pain to OTRS volunteers and makes some scripts unuseable. If it is a general issue, other things may be broken as well on different wikis.
The abuse filter hasn't been changed for months, so it must be anything else. There are several OTRS users affected per the filter log.