Mobs like Creeper, skeletons, zombies and spiders doesn't spawn in surface of planes. Even if Is at night while its a stormy weather.
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I studied More about the new versión mob spawning problem. And if you already have a world. This problem Will apear. Also Mobs like guardians in a ocean temple Will not spawn. Only spawn Illagers, EnderGuardians, and not hostile Mobs. This bug ruins my Mob farm. And The only way I find its ti create a new world. And even in the new gane, the Mobs spawn low in surface. Un caves are low but not to much.
Does clearing the lighting cache (edit world --> optimize world --> erase cached data) fix this issue?
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We're actually already tracking this issue at MC-155289, so we will resolve and link this ticket as a Duplicate.
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I have the same problem in my minecraft world.