i saw were this was addressed recently…
… but it appears there’s still some issues with matching (v 4.0.9 & Maya 2023). here are the repro steps…
- load in Biped Template Y-up from the mGear menu
- build rig
- load biped.pkr into anim picker
- constrain something to foot_R0_0_jnt & foot_R0_1_jnt
- toggle click Leg IK/FK in the picker to see slight offsets incrementing
the bug is more obvious if the character is rigged with feet pointing outward at a greater angle than what is displayed with the default biped.