Try using the Transform bone as a “Add to existing”, it should work as expected.
I remember trying Polygon and it was working fine, but I haven’t tested Metahuman so I can’t really tell if something is messed up…try to use the good old mannequin and see if the issue is also there, it might be that Polygon itself is the issue.
Regarding the IK override, the only thing that happens after the AnimBP for Metahuman characters is the PostProcess AnimBP, but there only the corrective joints are triggered accordingly to the limbs movement, so there’s nothing related to IK.
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