With /gamerule doMobGriefing false, blazes can still light things on fire.
Steps to make the bug work: (with MobGriefing false)
1. Spawn blazes in an area where blocks can be burned/destroyed
2. Make the blazes fire (go into Survival, punch it, etc)
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I hope this gets removed, if doFireTick is set to false, the fire won't disappear and fighting a ton of ghasts and blazes will fill everything with fire which you can't destroy on adventuremode (don't make fire destroyable to fix this ._.)
Indestructable fire in Adventure mode already documented in MC-2789.
This also applies to Ghasts - their explosions won't damage the map, but will still create fire. Aside from creating a lot of fire, blazes and ghats can destroy some blocks right away, like redstone wire, which is direct mob grief!
Confirmed in 13w11a and added Ghasts fireballs.