Board Thread:Support Requests - Getting Technical/@comment-43707041-20200514234055/@comment-9605025-20200515030641

Huh. That is a pretty interesting permissions glitch. I guess the only way to find out if it is the cause is to do as UpnCbs06 suggested. Or you could just file a ticket about Special:UserActivity and mention the GDM thing as a side note in case it is relevant.