Pistons teleport blocks instead of moving them smoothly

Pistons seem to be teleporting instead of smoothly moving the block. This used to not be the case in older versions of the game, including java this bug also has some terrible side effects such as possible epilepsy due to the block in font of piston flashing. normal case scenario, the block would move smoothly to target destination with no white flashing instead of teleporting to target and flashing.