I started 4 consecutive survival worlds and play for about an hour into each only to discover that surrounding forest biomes are completely burnt down or are burning down very fast. It may be due to denser foliage but fire spreads really well even over plains ... didn't know that was even possible - no Roofed forest can possibly survive for long in survival worlds that are essentially dry tinder. This makes playing the game a bit difficult if all the forest resources are ticking time bombs of fire. Did you mess with the tick rate of fire spread?