Using a lead on a chicken behind a trapped villager makes the chicken burst out, but this isn't the case for other 2 block tall mobs like a zombie.
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I could not confirm for 1.16.5. In my testing, the lead seems to be causing the chicken to "launch", not the villager. I was able to get chickens to launch out in the same manner as in the example video using the setup I have attached, by attaching a lead to the chicken, standing on the andesite block, and setting the diorite block to air.
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I can confirm for 1.16.3