Rotten milk can become un-pourable

I’ve had a couple instances where gallon jugs of milk that rot become completely un-emptyable.

Not sure if it’s getting caught in some kind of bizarre rotten/frozen state, but even if it is kept in warm conditions for a while it doesn’t seem to become empty-able. Haven’t yet had this issue with other liquids.

This was in 0.D Stable, so if this has already been addressed, plz ignore.