Non-fire resistant mobs don't try to avoid walking into fire

In 20w09a

After some testing this seems to apply to ALL mobs, actually. For fire-resistant mobs this is no problem and is probably intended behavior as mobs that cant be burned will pathfind through lava, which regular mobs avoid just fine. But not just Piglins, but Hoglins, Endermen, Sheep, Wolves, Cats, Parrots, Villagers, Zombies, Creepers, you name it, walk right into fire, sometimes even when there's a spot wide open to walk through. And this is just idle walking, when they're chasing something they'll make a beeline straight through it regardless of an opening.

And it seems they do sort of figure out when there's an opening, but they walk on the corners so get lit on fire anyways. And it seems Parrots try to fly over fire, but sometimes land right in it  when they get "tired" of flying. For Parrots specifically this also seems to apply to lava.

This all applies to both regular fire and soul fire.

In 20w10a

Confirmed for 20w11a

In 20w12a

Not fixed in 20w15a.

In 20w18a

In 1.16 Pre 3

1.16 pre 8 (piglins and hoglins)