I recently synced my world from the Xbox One version to the "Glitchy Together" update, and after reading about all these issues I started going around and inspecting all of my developed areas. Most seem pretty okay, with the exception of my zombie spawner grinder and a new problem of spiders ignoring the half slabs in my natural-spawn tower.

And then I went down into my branch mines.

When I first started those mines, down at the bottom of a ravine, I took down an ender chest and set it up next to the water channel I use to go up and down, to make transporting large amounts of harvested resources topside easier.

Does this look like an ender chest to you.

My ender chest somehow turned into a regular wooden chest. It still has the purple particles of an ender chest, but the contents of my ender chest are no longer accessible from it. The other two ender chests I have, one in my main base and the other by my busted zombie grinder, are just fine. Why did this one get screwed up?