In swamps, brown mushrooms are spawning in the wrong light levels and not removing themselves until a direct block update, light updates do not work
MC-198
Mushroom Lighting Update
Resolved
Invalid
1
luigifrx guy
(Unassigned)
Unconfirmed
Minecraft 1.4.2
Retrieved
This isn't a bug, it's rather a bug that you can't place them (in a swamp biome).