Starting from a Flow page (or topic) where I have about 10 unread posts sprinkled throughout the page. When I reply to one of the posts, all the sidebar indicators of unread posts get cleared. I have no idea which other messages I haven't seen before, so I have to read all 100 messages instead of just the new ones.

The behavior isn't crazy, but it is frustrating and unexpected. A warning would be nice, at least.

This seems related to T73072: Flow: Submitting 1 reply will delete any other reply-text-areas currently open in the same Topic, but is different.