In my specific example, I have dug a one block wide trench underneath a pillager tower and covered it with trapdoors. The top of the trench is at Y=61. The bottom of the trench is at Y=30 where there are stone pressure plates. There are hoppers beneath the pressure plates at Y=29. I have sticky pistons connected to each pressure plate in such a way that a note block plays when the pressure plate is activated. When I step on each pressure plate in turn, each correctly causes the respective note block to sound. When pillagers fall into the trench from Y=61 they only occasionally trigger the pressure plates. The fall is always fatal to them, their items if any drop correctly into the hoppers, but landing on the pressure plate does not typically activate it. But sometimes it does.
Once, an Enderman got into the bottom of the trench and as it walked along the pressure plates, each attached note block sounded correctly.
Since the wiki says that technically pressure plates activate when “the entity's collision mask intersects the bottom quarter-block of the pressure plate's space”, I presume the pillagers are dying and despawning before this occurs.
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Yes, nothing has been done to affect their spawn rate. They spawn, come to the tower any typically fall into the trench one at a time, occasionally two or three at a time. They drop only the ordinary and expected loot.
I have not experimented with other kinds of mobs falling into the trench.
Here is a view from the top looking down into the trench with a pillager in the process of falling in. When he hits the pressure plates at the bottom he visibly dies and despawns but the pressure plate usually does not activate. They activate perhaps 5% of the time when pillagers fall on them. When I jump into the trench, they always activate, and I presume this is because the height is not fatal to me.
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Please provide the setup (either via structure block .nbt or world file) needed to reproduce this issue
Sorry, how do I do that? I can give you the world backup, but it’s 600MB. I don’t know how to extract just the tower structure. I can give you the .mca file the tower is located in. That’s only 9MB. Is that sufficient?
[media]The region file (to my knowledge) won’t work by itself. Please attach the world itself. Or, if it’s too big, recreate the structure in a new world and send that.
I recreated the world using the same seed, transplanted my -3 -1 region file and then walked to the tower. That worked. The modified tower structure is present and the backup is only ~60MB instead of ~600. This is now 1.21.5. The problem is still present. I observed exactly one instance of a pillager setting off a pressure plate at the bottom of the pit with a number of others falling in and not setting them of.
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Can you describe the problem in more detail? For example, are the looters dropping a large number of items or a small number? Is there a high-load task at the time of the problem?