Item Frames - Item Duplication

In a LAN world when a player (not the host) places an item inside an item frame and punches the item, the item is duplicated.

What I expected to happen was...:
After a player places an item inside an item frame and punches the item, one item (the original item) should drop out.

What actually happened was...:
Instead, when a player places an item inside the item frame and punches the item, the item is duplicated. Two items drop out.

Steps to Reproduce:
1. Place an item frame on a wall or etc.
2. Put an item inside the item frame.
3. A player (not the host) must punch the item and two items will fall out.

Other Info
In Realms, the player that punches the item doesn't matter according to the following video. The video creator states that it only works in Realms, but I encountered the dupe in a LAN world.
https://youtu.be/Jj2rN7zq51k?t=1m11s

Here's another video.
https://youtu.be/5cohS6U4-OA?t=15s

I didn't create these videos.!