An asset can look correct in its source application and still fail after import into React Three Fiber. Treat animation integrity as a translation problem between tools, with clip ranges and joint orientation checked on both sides.
For React Three Fiber, use a short representative clip to verify joint names, rest pose, frame range, root motion, and deformation. Preserve the source rig until root motion passes review.
Check frame rate, clip boundaries, root motion, joint orientation, event timing, and deformation on a representative action. Apply this animation integrity guidance to the actual React Three Fiber delivery path.