minecraft bedrock edition - Why aren't the enderman spawning in

I'm in the end, in a space in the void, and near the bottom, at y = 2, where I'm not close to any specific piece of land where enderman can spawn. All spawnable places have been covered with slabs or

The farther you go from land the fewer Enderman can spawn. I don't know how to get better rates, and be away from large spawnable areas. How far out should I build

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April Fools update] Anyone else had the issue with enderman spawning infinitely? : r/Minecraft

April Fools update] Anyone else had the issue with enderman spawning infinitely? : r/Minecraft

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This is my mob farm, the doors are the afk spot, the simulation dist is on 8, why isn't anything spawning when i'm stood there? i can post more pics if needed (