Running downhill rapidly alternates poses and jumpability

[1j01]

When the player is running downhill, at some slopes, it alternates between the jump pose and run animation.
Also, jumping is presumably unreliable since the pose change is based on groundedness which is also what governs whether you can jump.

[1j01]

Here's a video about handling characters walking over stairs
Snapping to the ground if the player is near it as they describe should fix this.
There needs to be an exception for jumping, so you can, you know, jump, still, even if your jump velocity is lower than the snapping distance.
But it also shouldn't snap to the ground if you're falling towards it, as that would just disrupt the motion as you hit the ground, so I guess it should only snap if in the previous frame you were on the ground.