But there is still a bug in the updates coding creating secondary save states on entering worlds when first launching the game on Xbox that needs to be addressed regardless of whether you can dig into save files or not.
It seems saving after the bug happens doesn't lose your prior progress, I noticed even after saving and logging out it kept the old thumbnail on the world select, after reading through this thread yesterday I thought I had lost everything due to saving, however logging in and out repeatedly spawned my pre update save on the third attempt.
I have emptied my ender chest and inventory for the time being and probably won't be playing till this is fixed but this leads me to believe there may be two different save states that the game is attempting to load as it loads two separate inventories depending on which save state loads.
(Xbox series s)
@oyoyu If you pop a random item in the "failed to load" inventory you will notice it manages to load that item each time it fails to load the initial inventory.