Unload liquid into a sealed stomach that is in your inventory, so that the volume of the stomach would increase, and the inventory volume limit would be exceeded.
Try to put some items on a neighbouring cell. Get a error in the ingame-console and a message that some items tumble to the ground.
The items probably should tumble right after you unload liquid to the stomach, and the error should not appear.
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Even better, have it stop pouring if the inventory s volume limit would be exceeded.