Blazes were still spawning even though I had placed torches on all sides of spawner.
MC-183048
Spawners not deactivating with torches
Resolved
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MC-183048
Blazes were still spawning even though I had placed torches on all sides of spawner.
Blazes can spawn in higher light levels than other mobs. See also https://minecraft.gamepedia.com/Spawner#Disabling