The bug

Unlike other container blocks, decorated pots have no container components. This results in you not being able to pick a normal decorated pot.

Steps to reproduce

1. Give two default-pots and a container-pot.

    /give @s decorated_pot 2

    /give @s decorated_pot[minecraft:container=[]]

2. Place the default-pot and pick it.

Observed behavior

These two items cannot be stacked. And the container-pot always is selected.

Expected behavior

Both can be stacked, so the default-pot can also be selected.