Bedrock Edition has slightly different chest placement rules than Java Edition that make certain things more difficult or impossible.
- When not sneaking, the chest first tries to connect to its left neighbor, then its right neighbor.
- When sneaking, the chest tries to connect to the chest clicked on (to the right or left).
- When not sneaking, the chest first tries to connect to its north/east neighbor, then its south/west neighbor. This makes chest placement directional.
- When sneaking, rules are exactly the same as when not sneaking. This makes it impossible to choose how your chest will be placed when placing it between two single chests.