In game 3154258, I bought a Mint with potion in hand (I think). It trashed my potion. My intention was not to play the potion so that it wouldn't be trashed. I didn't notice it until my potion didn't show up for a few turns.
In any case, if it happened how I think it did, it's a bug with mint. Also possible that I clicked autoplay, but I suspect maybe I didn't, so I report it.