If you place a renamed container (like barrels, chests, trapped chests, or dispensers) and pick it up again it won't stack with containers that have never been placed.

Steps to reproduce:

1. Obtain a stack of barrels.

2. Rename the barrels in an anvil.

3. Place one barrel in the world and pick it up again.

Observed Result:

The broken barrel does not stack with the stack of barrels.

Expected Result:

The broken barrel stacks with the other barrels (as it does in Java Edition).

I tested it with barrels, dispensers, chests and trapped chests.