Tune_Raider

Have the same issue on my series X.  It's pretty consistent with re spawning me back at my base now with no levels as well as my inventory and ender chest empty. What works for me is I either save and quit then rejoin to gain my stuff back or load my redstone test world first, save and quit then load my survival world.  Not exiting the game for this, just going back to the main menu.

Regarding the simulation distance theory:  Playing on a Series X with a simulation distance of 4 chunks and I am experiencing this error on both Minecraft and Minecraft Preview with different worlds. I can usually just cancel out of the sync and the worlds will still save my progress locally.

Having the same issue.  XBox one crashing right after opening world.  Also noticed the arrow/chest icon in the upper right is constantly saving after taking a few steps in any direction, always.

As a result of renaming these back to their proper id name they have since gone missing from chests.  I had several empty shulkers stored in a chest at my main base and also at a project I was working on.  the ones at the project were not empty.  This rename did not seem to affect any of the shulkers that weren't in chests.  Playing on Xbox one here.

I noticed when I set my world difficulty to peaceful I was once again able to load it. This affected both my raid and guardian farms.  This needs to be done prior to loading the world if its completely locked up and kicks you out before it even loads.  Playing on Xbox 1 here. 

This is present in the latest beta (1.16.0.63) on Xbox as well.

This has happened to me as well. Lost a few shulker boxes and their contents as well trying to transfer the items over to a barrel as a result of the crash.  I did notice that if you drag an entire stack into the last slot rather than using the quick transfer the game doesn't crash.