I want to make zombies spawn less in caves, but i don't know how, this is what i use but it doesn't work.
I'm using 1.20.1

[
  {
    "mob": "minecraft:zombie",
    "seesky": false,
    "result": "deny"
  }
]

Me too, have you solved it?

How are you testing this?

I posted a recent comment, please take a look:) @McJty

Where?