While in realms on 16.0, some users in Pocket Edition and some in PC Win 10, when one player feeds/breeds an animal, the other online players currently held inventory item gets replaced completely by the food item that was fed to animals.
An iron axe that was being used while another player fed an animal, disappeared and was replaced with the 26 wheat the other player was using to feed the animal. Happens with any held item at the moment of feeding. if the other players are not holding an item when someone feeds an animal, then the food gets added to all the other online players open inventory slot.
EDITED TO ADD:
This also happens randomly even when no players are feeding animals. At a single moment, all realm players had 9 cooked beef appear in hotbar slot 6.... and if they had something in that hotbar slot earlier, it was gone and replaced with the beef. Same item, same qty, same slot. Totally random. Makes playing the game very difficult. Players lost diamond tools that were replaced with beef.