Bedrock Edition has slightly different chest placement rules than Java Edition that make certain things more difficult or impossible.
Java-specific behavior:
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).
Bedrock-specific behavior:
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.
Thank you for your report!
However, this issue has been closed as Postponed.
Going forward we're going to be tracking parity issues and feature requests on the Minecraft Feedback Site, and we'll only be tracking bugs here at bugs.mojang.com.
We're already working on achieving parity across versions where possible, and we're very keen to hear your requests or suggestions, so we'd encourage you to make a post at https://feedback.minecraft.net, or upvote an existing topic there.
If you're not sure whether your issue is a parity request or a bug, hopefully this article will help explain further: Parity Request Guide
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