Forgive me if I duped this, I tried finding it, I find it hard to believe I am the only one to notice this though, unless something changed purposely and I am not aware. Tried searching the wiki and stuff.

I forgot to mention that I am in complete survival mode, I created the world with absolutely no cheats and it has been quite fun lol. So i did nothing with the doFireTick command! From my comment below, "But I do have to add that while i was mining i came across another situation and after some time the wood the lava was next to burst into flames but the wood the lava was on top off remained unaltered like it was stone or something that wasn't flammable."

Fire isn't spreading to wood blocks that are touching lava. It's really weird because I am so used to seeing them on fire lol

As for reproducing.. um, all I did was walk in a mineshaft I found and saw it so. I just found it i mean.