LB and RB to change between different inventories do the same thing. Usually LB changes player inventories and RB changes environment inventories but both buttons change one side right now. You can still change sides by closing and reopening the inventory screen, but still you can only cycle one side at a time. (EDIT By side i mean the player inventory side and environment inventory side)
-side note, thanks for all the work on the game over so many years, devs. This is one of my favourite games.