Duplicate items in chest

While in a Survival LAN game. I used my iPad Air, iPhone 6s+, and my Win 10 PC (using Win 10 Beta Edition) all at the same time. I also used my iPhone and iPad Air only at the same time with the same results. I also used an iPad Air, iPad 2, and my iPhone together. Everyone look in the chest. Anyone can place an item in the chest. Everyone sees the item. Have the iPad AIR character remove the item FIRST! The item will not disappear for the others. Everyone else can remove the item. Repeat until you have the desired number of items. I duplicated diamonds, string, enchanted fishing pole, and gold successfully.

Minecraft Ver. v0.14.3
iPad Air running iOS 9.3.2
iPhone 6s+ running iOS 9.3.2
iPad2 is running iOS 9.3.1
PC running Win 10 - 64-bit OS

The key is to remove the item with the iPad Air first.

**UPDATE **
Updated Minecraft to 0.15.0 on all systems
Duplicating Bug still exists - But now there is a slight difference...
While using a Win 10 PC with Beta 0.15.0 and an iPad Air - nothing has changed - Remove the items from the chest with the iPad Air first to duplicate, BUT,
using an iPad Air, iPhone 6s+, and iPad 2 - you have to remove the item(s) with anything but than the iPad Air first. The iPad Air needs to remove the item last.

When I tested with iPad Air and iPhone 6s+ only there was a slight twist. When the iPhone removed the item the iPad could then remove it, but if the iPad put the same item back into the chest the iPhone could not see it. To duplicate an item the iPhone had to put the items in the chest, then both could see it. the iPhone would then remove the item and then the iPad. Only the iPad Air could duplicate items.

**UPDATE **
Updated Minecraft to 0.15.4 on all systems
Duplicating Bug still exists - But now there is a slight difference...
Yes, I can still reproduce the issue. It does not matter if I use an iPad Air this time. It seems to be a timing issue on when the item is placed in the chest and when it is removed and when others see the item. I duplicated items using an iPad Air and an iPhone 6s+, also with an iPad Air and a Win 10 PC, and also with an iPhone 6s+ and a Win 10 PC. There seems to be a lag on when items are placed in a chest. I sometimes have to close and then open the chest with one character just to see the item. Once both characters see the item, the item can then be grabbed by both. The one placing the item in the chest always sees it right away, but the other character usually (but not always) has to close and then open the chest to see the item. With both characters seeing the item, if the item is removed by one character and then the other character closes the chest before getting the item - once the other character opens the chest again, the item will be gone (no duplication). With the iPad Air and iPhone 6s+, if the iPhone removed the item first the iPad could not get the duplication item (it disappeared too fast).