Mobs can spawn on wither roses. Mobs should not spawn on blocks that will cause their death like for example magma blocks,fire,lava
Only mobs that do not take dmg from wither roses should be able to spawn inside of them,like pigmen on magma
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Awesome solution design...
Fixing this like reporter suggested can cause massive exploit by making witcher skelly farm that can't spawn any other mob in nether fortress.

@michail yeah and right now everything just spawns in there and gets killed besides wither skeletons. it woul not make for super op farms they would stay about as good as they are now. but it would infact remove the wither rose as 1 block solution for literally every farm in the game

Blazes can fly up, so they can survive and nerf part of contraptions by filling mob cap or even hunt player.
I would block all spawns in wither roses to avoid wither skeleton farm boost.

Block mobs from spawning in any flower block then... consistency is a thing.... Why just wither rose....

— Block mobs from spawning in any flower block then... consistency is a thing.... Why just wither rose....
@Aman
Because mobs take damage in wither roses. Thats like saying "Block mobs from spawning on any block, why just magma blocks?"
also stop troll
Mobs are not supposed to, but the player can respawn into lava, for example from a bed. Remotely related design issue or reason to mark it WAI?