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If flamethrower turret is placed in range of enemy flamethrower turret, those will automatically attack each other (as they are enemy and military buildings at once), even though they can't damage each other (immune to fire).

Flamethrower turrets that way ignore all other targets and continue so until they run out of oil.

Expected behaviour: Flamer turrets will ignore other flamer turrets same as they ignore walls and similar non-flammable objects.

How to reproduce: Start a new map in editor, place turrets facing each other, switch one to be enemy force, give one of them a fuel.

Thanks for the report. Nothing in the attacking logic cares about an entities resistances and I don't consider it worth changing the logic to try to be that smart. Something being resistant to a damage type just means it can't be hurt by it. In this case I consider it correct behavior that it "draws fire" because it's immune.