Gravity affected entities when placed on a moving block connected to a sticky piston break (in the case of sand, gravel, concrete powder, and anvils). They work as intended when placed above the piston head of a normal piston, and fall down as they should. The armour stand ends up moving with the block attached to the sticky piston, and clips through the normal piston head. I tested this in java as well to make sure this was not an intended change and it works properly there. Also to note, the gravity affected blocks work as intended from other methods (i.e. placed on another that breaks from the piston, the one above will work as inteded).