I'm having the same issue. It seems to be connected to either (1) placing or removing items from a furnace, or (2) using certain items, such as wheat, seeds, or potatoes to feed animals. Over a 20 day period I've lost numerous items due to this bug on both Windows 10 and PE while playing in Realms.
This is also a serious problem in our realm. I too have lost several horses/saddles due to this bug. Escaping the issue entails running out of the affected area while removing the map of the area from the hotbar. It's extremely frustrating.
I'm having the same issue. It seems to be connected to either (1) placing or removing items from a furnace, or (2) using certain items, such as wheat, seeds, or potatoes to feed animals. Over a 20 day period I've lost numerous items due to this bug on both Windows 10 and PE while playing in Realms.