Gamemode: Skyblock Extensive explanation of the bug: I have fine grass platform (for animals) and xp-mobfarm, but no mobs spawning. I'm fully sure, that farms has all requirements to spawn mobs. I've been played on lots of skyblock maps on servers, also some singleplayer skyblock maps. Those simple-designed farms worked fine. Time and date when the bug happened: Let's say - last 24 hours (5th june). I've seen threads telling about same problem, but without this template. Hope, it will be solved.