fill air "replace" over containers causes them to dump items

Windows_Minecraft - Release_920093
(Beta 1.5.0.3)

Summary:

Using fill air "replace" on containers will dump the contents of the containers.

Impact: 
makes it impossible to properly manipulate containers using fill air dumping excessive items on the ground around the source. It is often required in map making to remove chests and other containers for various reasons, this makes it impossible without the player getting the items and is inconsistent with behavior on java.

Repro Steps:

1. Open the attached “clone setblock bug world”
2. Press the button at MCM-258 to fill air "replace" over containers

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

Expected Results:
The containers should be removed successfully but the items should not drop. Java handles it this way.

Screenshots/Videos attached:
repro world attached.