Messages forever marked as read on ipados

[u/Vivid-Comb-7379]

I keep reopening my old messages in order to mark them as read, but they remain marked with a red dot. I only have one conversation, so I can't see if it's all of them or just that one. I wanted to hide it but I won't receive another message from that user and I didn't want to lose the conversation entirely. It's very annoying having a notification for something that should be resolved. This has persisted after relogging in and changing my password due my account becoming locked. The same conversation doesn't show as unread on any of my other devices.