Might be a bug, might not be. The issue was not present in 1.7.10. When given a large, dark platform a good distance away from the player above Y128, mobs will not spawn.
Might be a bug, might not be. The issue was not present in 1.7.10. When given a large, dark platform a good distance away from the player above Y128, mobs will not spawn.
Is this in the overworld or in the Nether? Also what render distance are you on?