Samsung Galaxy Tab S7 Plus
This is true for me as well, but only if worlds are in external storage.
I can confirm that hoppers are no longer pulling items out of chests, or furnaces.
I can confirm this as well. Using a nvidia shield k1 running Android 6.0
It isn't just loading old worlds. Using the current beta the game will not create a new world, or load an existing one if i am using external storage. If i erase all game data it will let me create new worlds in internal storage, but if i try external storage nothing works again. This is with our without the caves and cliffs experimental mode toggled.