A fix for you will be to use the ignore option without the find member list since you know who you want to ignore.
- Jay -
I did block, and ignored the user, I asked them a question before doing this in privately but I didn't get the response, I didn't hoped so tbh based on what the person said, and did.
I think the post above mine is his, anyone can try putting his username in 'Find user' field and see if a different username is shown.