I think that's because they don't actually deal fire
damage, but something like acid
probably. I could also give the bots acid resistance, but given that the whole point of this mod was to avoid friendly fire from your own flamethrowers, I don't really want to do that.
If I ever feel like it, I might make it so you can configure which resistances you want your bots to have in the settings. Though this mod is really just a quick and dirty fix for a problem that was bothering me, so I'm quite happy keeping it's scope to the 4 lines of code that it currently is (I probably spent more time writing this post than I did making the mod lol).