Mobs (chickens and villagers observed) are once again glitching through surfaces.

ex 1:  I have a chicken cooker with two hoppers that chickens sit on.  The chamber is two high.  The back hopper directs eggs to my sorting system.  The front hopper directs eggs to a dispenser that fires them to create chicks (standard cooker).  I have a pair of stacked pistons that can be extended to push all chickens onto the front hopper when I don't want eggs.  The machine has been in this configuration (pistons extended) for months.  Since 1.16 I often come back to my base to find that about half of the chickens have glitched through the piston head and are on the back (egg) hopper.  Simply cycling the pistons will fix this but it happens again and again (not always...about 50%).

ex 2:  I recently got up the courage to visit one of my raid farms again in the hopes that my resident villager there would not despawn this time.  I activated the trident killer where the raid captains are killed then climbed to the kill platform.  I was quite pleased to have three raids go off without a hitch but then was treated to the site of my villager falling from his fully enclosed bed (bottom exposed but fully boxed on sides and ends) and into the same trident killer (farm has two, one to kill captains the second to kill the raids) that had just finished with the third raid.

II really won't go into the effort it took to get that villager 100 blocks into the air and centered under the raid spawn platform.  I'm just glad I made a backup.