Yes, I have. It wasn’t just one tile. I set a fungal bloom on fire, and apparently the fungal spire itself is fireproof, but the fungal walls that it infinitely respawns are not, and I didn’t want to use ammo on it. There was a lot of fire. I tried one tile, I tried the middle of multiple tiles, I tossed the throwable one directly into the fire and looked for it after I blew the spire to pieces with heavy machine guns. The only thing I didn’t try was actually setting myself on fire.
I mean, that happened later in a temple, but I didn’t have an extinguisher on me. RIP cloak, I shouldn’t have taken you with me.