The bug

The green icon / marker displayed on a map when a copy of it is placed in an item frame is not removed in all situations.

Affected situations

Basically everything which does not call EntityItemFrame.removeItem(ItemStack) (MCP name)

• When destroyed by explosion
• When /killed
• When map was removed by updating NBT
• When ItemDropChance value prevents dropping
• When gamerule doEntityDrops is false and item frame breaks, e.g. by removing supporting block

How to reproduce

1. Switch to Creative mode for simplicity
2. Create a map
3. Place an item frame and place the map in it
4. Use one of the affected situations described above
   → The green icon remains even though the map is not inside the item frame anymore