I think this is happening to me on my PS4 - still realms.
I've had the double chest issue on this same world, and for some reason it fixed itself.
A few months later, I'm building an item sorter and this happens. I thought that it's the double chest thing, and so I deleted the chests, hoppers, and all redstone and used the fancy leaves trick to map out the chunk. Right after I mapped out the chunk, I crashed.
I reloaded, went to this area, and started writing this post, and as I finished this last paragraph, the realm crashed. I didn't access any chests (the load respawned what I had builtb of the item sorter), I just sat on the ground while typing.
So, now I'm going to reload, break those redstone devices and chests, and wait several minutes.
Another crash.
My main village is nearby... Never had problems until trying this build. I actually started building this "library" several days before the crash, but only started the chests/hoppers/redstone yesterday - when the first crash started.
I've had this similar bug 3 times. 3 different chests. One side of a 'double chest' goes invisible. If I try to access the invisible side it crashes the realm and loads a backup.
I fixed the first chest by destroying it.
I also have mobs that disappear and attack me.
I'm going to download my oldest save just in case. Thank you, ambient, for bringing my attention to the fact that the entire save could be corrupted.