REPLICATE: 1. Log in to OPAC. 2. Find a Biblio and open the comments-tab. 3. Wait for the session to timeout, or logout from another tab/window. 4. Modify/create a review/comment. 5. Save it. 6. Go to the staff client and moderate "Comments awaiting moderation". 7. Observe the review/comment as being created from "(deleted patron)"
This problem caused us some headache as it happened quite often in one of the libraries we support. I just confirmed that the problem still exists in 18.11 and therefore possibly master as well. Thx, Olli, for reporting!