Mobs start to spawn on the nether roof and there is some terrain on the nether roof above y=128. There is terrain generation for every biome and bedrock gets replaced at many places. It affect the rates of mob spawns in structures like fortresses and in the nether cavern(below bedrock ceiling). Please resolve this issue. It is very important. I have tested it with multiple worlds. The screenshot and heights are included.
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We're tracking this issue in MC-239860, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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Duplicate of MC-239860 which was later resolved as "Works As Intended".