clone move dumps items from containers

Windows_Minecraft - Release_920093
(Beta 1.5.0.3)

Summary:

Using “clone move” on containers will dump the contents of the containers that moves from point a to point b

Impact: 
makes it impossible to properly manipulate containers using clone dumping excessive items on the ground around the source. Since it’s impossible to give players items with lore and names, so clone is the only way to accomplish this.

Repro Steps:

1. Open the attached “clone setblock bug world”
2. Press the button at sign for MCM-255 to clone move the containers

Observed Results:
Clone was successful but items were dumped on the ground, this occurs regardless is tiledrops is on or off.

Expected Results:
The containers should move successfully but the items should not dupe. Java handles it this way.

Screenshots/Videos attached:
repro world attached.