When I attempt to ignite a tree, fire does not spread despite the "fire spreads" setting is turned on. Fire also does not consume any flammable blocks even if left for a long time. It also does not extinguish itself when left on the ground.

The fire does,however, still burn animals and mins and kills them.

Note:
I searched and saw issues like this, but I guess this one happens because of beta (Idk)
The photos below depict fire with the highest random tick speed and was left for a few seconds.