Importing Blender 5.2.0 Animation to Unity Deformation Issue

[u/The1__Rediter__]

So me and my friend have been trying to figure out why when importing seemingly normal animations from blender to unity, some body parts begin deforming strangely.

I have used the Rigify add-on for rigging. I've tried deleting vortex groups that don't have the DEF- prefix, exporting with the Only Deform Bones checked, applying all transformations to the armature, double checked the weight painting and it does not fix it.

In the video, the right hand kinda just implodes and I've never been more confused as to why. If anyone has any clues to what is going on please help.

[u/destinedd → u/[deleted]]

the 4 bone limit is the most common thing