or the whole body of a mob <= 1 block tall) can spawn only in an air block

For the mob to spawn, a solid top surface must be beneath the spawn location.

on . (I.e. mobs cannot spawn on carpets
right-side-up stairs
redstone repeaters

  • Mobs cannot spawn on transparent full blocks like glass and leaves.
  • For mobs that can spawn floating in water or flying in air
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