"/gamerule doFireTick false" does not stop fire from spreading from lava.
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Unable to reproduce.
appended "from lava". Make a 1x1 lava pit and fire will spread from it.
Yes Lava creates fire but the fire won't burn anything and won't spread any further.
It burnt down a wood house.
Unable to reproduce.

Can still not reproduce.
The flying lava droplets will ignite some blocks around, but the fire doesn't spread and the blocks do not burn down.
It is igniting stuff and creating harmful fire, even though doFireTick false should prevent fire sources from spreading without player influence!
Lit netherrak inside a brick fireplace burnt down wood blocks around the fireplace
Ghastballs can make fire, even if doFireTick and mobGriefing is on false! Imagine an adventuremap with ghasts, you are on gamemode 2 so you can't extinguish fire, so the fire will grow with every ghast ball! You can't destroy it, you can't extinguish it, you will die after a while because you can't hide from the fire anymore! This needs to be fixed!
Cannot confirm, see screenshot.