Sometimes a post fits into multiple communities.

This one is a meme so it’s in the 2 big meme communities (the community is highly fractured between the two because of people’s opinions of .ml and .world), it’s also a Simpsons meme specifically so it ends up in Simpsons meme communities.

Tbh I think they should make it so if a post is crossposted (which they know already) then when it’s marked as read, it’s marked as read across all of them. This would have side effects but it’s the best solution I can think of to the problem.