What I eventually did was this. I used the solution marked in this post, using RunService.Stepped, but to keep from falling through the terrain, I create an invisible part for upper torso, lower torso, and head, and weld these to the HumanoidRootPart. So when an animation is happening, the non-collision body parts are moving where they need to move, and the invisible body parts (ones I added) are keeping me from falling through terrain.
Also be aware of this upcoming change.
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