I responded to a review, and the user replied directly to me, using the mention "@alexds9", but I never received a notification about it. Here is the link to the review: https://civitai.com/reviews/94705.
A message from @ouikok is not appearing in my notifications at all.
I believe that notifications about messages are some of the most important features on the site. They enable creators to receive feedback, clarify misunderstandings, and establish connections.
Currently, I am unsure of the exact scope of this problem. However, given the presence of multiple hidden posts, it's likely that many messages have been lost this way.
My guess is that this issue affects various types of messages.