Entities in blocks get pulled through the back of retracting sticky pistons
Whenever a piston activates and the head pushes through a Blaze, the Blaze is not pushed and, when the piston retracts, the Blaze is pulled into the piston block and the blocks behind it.
The Blaze does not have to be enclosed; the piston arm just has to activate into the same occupied block as the Blaze
Blaze farms utilizing pistons are now prone to breaking