fremennik trials, seer's test, freezing the vase of water gives vase of ice without removing vase of water

What I did: Put water into vase, put vase on frozen table

What I expected to happen: Vase of ice replaced by vase of water

What actually happened: Vase of ice obtained, while keeping vase of water

IDs of related NPCs/items: 3735 (vase of water), 3736 (vase of ice), 4169 (frozen table)