Why does Source Scale Factor in UE5.6 Retargeter ignore values <1?

Trying to retarget Mixamo anims to a smaller custom skeleton (CS2 character) in UE5.6.

If I put Source Scale Factor above 1 it works (target character becomes smaller).
But if I put anything below 1 (like 0.36 to shrink) it just ignores it, same as if it’s set to 1.

Is this normal? Like it only works for scaling up, not down?