When a monster falls into the hole, I just pull the lever and crush the monster who steps in it.
EDIT:
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Make it two deep so they get stuck and make it automatic with pressure plates on the bottom.
It still wont work, extended pistons are transparent blocks and dont do any suffocation damage
If this is Java edition, press f2 to take a screenshot
It’s bedrock, Redstone can’t be placed on pistons while they are extended in java