On the screenshot I showed, I had done what I always have with Resonite. I bring the avatar, with the asset on it and turn that into an avatar in-game, assuming you do the same in Unity for the purpose of VRC. So, you put it all together in blender. Not assign , in this case the harness, later in Reso'/Unity.
And just to test; if you've got it set up and prior to pressing Play, select the armature and pose the thigh if it's still consistent, or it breaks as well at that point?
