+Here are the list of each problem for Redstone devices/contraptions   

*Dispensers and/or droppers  drop item not in a desired location causing the T-Flipflop alternative dropper circuit not to work

• Observers don't detect changes from each others and other devices causing contraption to not work
•  Redstone is unstable and dose stuf that was not planed
•  pistons are slow and laggy causing a feature in java edition when pistons sticking ut there block to not happen because of the slowness and lagyness