My grinder has no holes in it, it is a box with a staircase made of bottom slabs. Mobs shouldn't spawn on bottom slabs due to vanilla minecraft mechanics. I can attach a picture of it if that would help?
Title says it all. If there is a block that stops mob spawning I'll delete this, or if there is a reason that this mechanic has been turned off. I was just confused when mobs were spawning where I didn't want them to, even after trying to stop them with slabs and carpets.
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