I think more research on the topic of bugs with droppers and pistons should be done because as far as i can tell the have been acting as the same block, the dropper, (as far as i can tell) has only been able to drop an item into the inventory of a different dropper in one direction.

There are other bugs on this topic plz look into this it is very limiting for** Bedrock* *redstoners

this has went on for 1 or two updates