Players with gamemode creative can open ender chest!!!

You can fix this problem by doing this:

gamemode-change:
change-level: true
change-economy-balance: true
change-inventory: true
change-ender-chest: true

Make sure you change: change-ender-chest: to true then the ender chest will change when their gamemode changes.

Or add ender chest to the "interaction" list.

Closing due to invalid configuration.