Villager trade GUI does not close when a major change happens to the Villager, leading to free trades and quick stock refreshing

See 9:55 (link starts at that time) to 14:05, and 15:40 to 17:50 here.

The "major changes" include:
Villager turns into Zombie Villager
Villager changes dimensions
Villager work station is moved out of range of the Villager (allows trading at no cost of the player)

This should be able to be fixed by making the GUI close if something happens where you shouldn't be able to trade with the Villager while it's in that state.