So, I was playing around in the twilight forest since everything is already automated (except bees cause I do my breeding manually currently) and was exploring a labyrinth. I came across one of those vaults that can contain the rarest stuff (including a maze breaker) and started mining it. In there, I found 2 vanilla ender chests. When I tried placing them down, nothing was happening at all. I then tried to place them on multiple surfaces (from XYcraft structures to vanilla wood, including almost everything in between) but it just couldn't be placed down. I can craft them, so they're not completely disabled.. Anyone has an idea on what could be going on?