In a world created in the 1.16.1 update item frames with items or maps inside wouldn't break. (Item frames without items break as usual). When attempting to recreate it by making new worlds and putting items in item frames, then breaking them, the bug was seemingly not there.

When testing out some mapart on a new world i tried breaking the item frame. I thought it would just break as normal.

When i did punch the item frame, it just stayed on the block and neither the item or the item frame disappeared.

To repoduce do the following:
1. Put the attached .rar file on your computer and extract it. (Feel free to check the files if you're skeptical about the legitimacy)
2. Drop the Save into your saves folder in .minecraft.
3. Start up Minecraft and enter the world.
4. Attempt to break the item frames.