Question MultiParentConstraints Setting source object weights at runtime not working

Setting MultiParentConstraints source objects weight at run time in c#. Weight not changing - Version 2020.3.19f1.

Set up:
Scene:



Code:
public MultiParentConstraint TertiaryWeaponRig;

public void Update() {
WeightedTransformArray a = TertiaryWeaponRig.data.sourceObjects;
a.SetWeight(0, 1f);
a.SetWeight(1, 1f);
TertiaryWeaponRig.data.sourceObjects = a;
}


The weight is getting set in the WeightedTransformArray. However when i set it to the multiparentconstraints source objects the weight is not being set in the original object. I checked to make sure the multiparentConstraint is getting set and the index (0,1) are set to the correct indexes.

Any help would be great.