I just noticed the same issue on seeing your own posts. Other apps like Mlem, Memmy and Voyager seem to have found a fix for this, because in those apps I can both see my saved posts as well as my own posts, even though I’ve already read them.
On. Larger note about hidden read posts. I feel there should be something to let us know that there would have been a post but it’s hidden because already read. Maybe read posts should be collapsed like comments instead of hidden.