When playing local split screen, when the 2nd player joins they have had their spawn point and inventory reset and they are unable to interact with anything in the world (ie break blocks, open doors.. They can use minecarts though strangely).

My brother and I have been playing in this world for a while in local coop on this xbox one with no issues until recently. At first we could get around this bug by closing the game and reopening it, but since the recent update a few days ago he seems to be permanently stuck in this state where he cannot interact with the world.