Chest Glitch 1: Double Chests can be placed next to each other (See attached screen shots).
Chest Glitch 2: Chest floating item (item when dropped) is a tile not a block (see screen shots)
Chest Glitch 3: Chests in hand is a tile not a block (see screen shots)
Duplicate of MCPE-4866, and the chest bug 1: according to tommaso chechi is working as intended by now...