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Type:
Bug
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Status: Resolved
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Resolution: Fixed
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Affects Version/s: Minecraft 19w12b
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Fix Version/s: Minecraft 19w13a
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Labels:None
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Confirmation Status:Confirmed
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Category:(Unassigned)
With recent changes to glass (and stained glass) from non-solid to solid to (almost) non-solid again, mobs now spawn on it. May be related to MC-139394.
Edit: Further tests showed monsters also spawning on most transparent blocks, as long as they provide a full surface. Tested Glowstone and Sea Lanterns in the Nether, since light doesn't affect most Nether monsters.