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Bug
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Resolution: Fixed
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Minecraft 18w43c, Minecraft 18w44a, Minecraft 18w45a
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None
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Unconfirmed
Regular mob spawning (not spawner or similar) doesn't happen on any height higher than the top block in that column that was naturally generated.
For example, in the Nether, nothing spawns at height y=129 or up, in the Overworld mobs don't spawn on a platform built next to a mountain, but they do spawn on the mountain.