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Based on observations, either hostile mobs spawn >128 blocks from the player in force-loaded chunks and immediately despawn, or they don't spawn at all. The former seems more likely. Regardless, this means that without very particular mob farm designs, mob farms cannot operate in distant force-loaded chunks.220.127.116.11 13:54, 12 May 2019 (UTC)
Bad info in the table
Random ticks occur only in player vicinity. See Talk:Spawn_chunk/comparison for my check results. Mob spawning remains to be debunked.