Rephrased summary: If a copper chest is opened and its oxidization state gets changed or it gets waxed or unwaxed, it stays open, but only until the game is reloaded.
Steps to reproduce
Using a copper golem:
Create a copper golem with a copper block and a carved pumpkin to get both a golem and a chest
Wait until the copper golem opens the chest
Or, using a player:
Craft a copper chest and get another player
Tell that player to open the chest
Next step is the same for both instructions:
While the chest is open, wax/unwax it or change its oxidization state (do not break the chest)
Expected results
The chest will close after interaction with it is finished. The copper golem will take an item from it, if there were any.
Actual results
You get a copper chest that will be opened until you break it or reload the game. If there were items in the chest and you used a copper golem, its animation will get interrupted once the chest’s oxidization/waxed state is changed, and it will not pick an item.
Duplicates MC-300406.