As well, it looks as though there are two chests spawning in the same location when opening them (as seen in the first screenshot). The second shows the particles of having just broken the chest to pick up (you can see the floating chest between the one that remains and the wall). The seed is -631592091127983917, you can see the coordinates for the temple in the screenshots as well. I logged out and back in to find the broken chests gone. Yes, I commented about this in another thread, but wanted to supply screenshots to help in my explanation.