The bug:

When decorated pots are equipped to an entity's head, it's translated backwards off-center.

The translation is defined in "/assets/minecraft/models/item/decorated_pot.json"

"head": {
    "rotation": [ 0, 180, 0 ],
    "translation": [ 0, 16, 7],
    "scale":[ 1.5, 1.5, 1.5 ]

Steps to reproduce:

1. Summon an armor stand with a decorated pot on its head:

   /summon armor_stand ~ ~ ~ {ArmorItems:[{},{},{},{id:"minecraft:decorated_pot",Count:1b}]}

1. Notice the decorated pot is moved backwards