I found that the mh_arkit_mapping_pose asset comes “out-of-sync” and you want to update the source animation. See the fix below:
Hope that helps. I am using IClone to animate my metahuman, even though this pose asset is not needed, everything works fine in UE 5.0.2 and a custom metahuman. If this update doesn’t fix it, perhaps is something on the Live Link app side.
Let me know if that fixes the issue.