I thought it’s a little weak for a bug report because I only noticed a fact, but I couldn’t check why it happens on Meta. So, I couldn’t provide steps to reproduce it or determine whether this issue is related to something that would affect other sites or is specific to Meta. Maybe you just hide some users from what I see when I check the moderators group 
So, yes, the question of why sending a chat message to moderators doesn’t work was specific to Meta. I knew it could result in a bug report, but I don’t have the necessary information for such a report.