When exploring a trial chamber, pots generated with loot in them that is not yet generated can take in items, allowing you to place items in a pot that already has items. When the pot is then broken, items you placed inside it are given back to you as ghost items.
MC-266503
Pots generated in a trial chamber can absorb items
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Yep, Came here to report this, It is not necessary to break the pot, just open the inventory, and click the slot where the item was and it will reappear.