MC-9553 was mainly fixed, but its duplicates MC-93070, MC-110000 and MC-159390 still apply. As asked for in 9553, I'm creating a new report for it: Item frames, item entities, specially rendered or transparent blocks don't render behind slime mobs (not slime blocks). I have not tested all entities.
Yes. I don't know why it said "entities" in the description, according to my screenshot, general mobs were never affected, so I removed that. In 20w22a paintings are no longer affected, but item frames still are, as well as now also items (which worked properly before). I've also added a better check for glass to my screenshot. (Also, I think I can edit tags, in the "edit" menu (top left button), is that intended?
It also affect water and nether portal.