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Bug
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Resolution: Cannot Reproduce
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None
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Minecraft 18w47a, Minecraft 18w47b, Minecraft 18w48a
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None
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Unconfirmed
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(Unassigned)
according to minecraft wiki spawn mechanics you need at last 2 blocks of headroom above an opaque block to spawn a mob , the last two snapshots broke the spawn mechanic requirements for hostile mobs.
here's an example that tall mobs and spiders can somehow spawn on a piston with 1 airblock above. and get pushed on the glasblock.
if i close the gap between both quartzblocks, mobs can't spawn anymore.