Night's Bite is not affecting Entangle

Night's Bite Oracle hidden passive affects Fireball but not Entangle. However, Entangle is a spell as well.

Is it only for projectiles even though it says "Spells" not spell projectiles?

I just discovered this myself. Doesn't affect entangle or bone cage but does affect thunderstorm.

Maybe it's got to do with the physical damage? I don't see why that should matter.

If that's the case. The node description should be updated because it clearly says spells.