I'm not sure why the hip joint at top of ik chain is flipping at certain angles, but since there are no keys on the joint itself, I can't use the euler filter. Anyway to overcome this? It drives other joints, so I could wedge in some intermediate attribute that gets keyed on/off to compensate for the flip, but that's a sad solve. Any better ideas?
Left hip, primary axis is X, Z pointing +Z.