Anyone know how filter lemmy inbox rss to unread replies only?

One small issue I have with Lemmy inbox rss is if I ser my poll rate to say ever 10 min there are times I may see a new message early and mark it as read. However 10 min later I get a new notification for the notification I just read from my inbox.

Sorted syntax and unsorted seem to be same file with no changes.

Any ideas?