When I place an item frame and try to put something into it the entire realm will crash. I tried with maps, a potato, and a pair of pants. Sometimes you lose the item but mos tof the time it does a small weird roll back where you haven't yet placed the frame. It takes about a minute and a half for the Realm to come back up. Had some fun crashing others while on the Realm, but I'd really like to be able to place and use item frames now, please!!
ETA: These were newly made frames, and also I tried on different walls/wall types/places.
(searched for this, but couldn't find it listed)