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 lighting, all, but the four endstone blocks in front of me, in the enclosed, roofless 2x2 area.
Still, even with that area being the only one spawnable, no enderman are spawning at all. I've tried going away and coming back, I know they won't spawn if I'm already here, but no matter the case they don't spawn.
Am I missing something?