RigBuilder.Build() Bug

Question

When I call rigBuilder.Build() in my script it converts all rig weights in the scene to zero.

But when I call it like rigBuilder.Invoke("Build", 0.01f) it works without affecting the rest of the weights of the rig. I used to call it like this in the past, but I can't do that anymore because I added some things to the script to solve other problems, and when calling it like this, Unity crashes.

This is my script:

public void EquipOrPutAway(Gun gun)
{
    if (CanEquipOrPutGunAway())
    {
        if (hasGun())
        {
            if (gun != activeGun)
            {
                WantAnotherGun = true;
                SelectedGun = gun;
            }

            isEquippingOrChangingGun = true;
            IsHolsterIn = true;

            activeGun.audioSource.PlayOneShot(activeGun.HolsterInClip);
            activeGun.audioSource.minDistance = activeGun.MinSoundDistance;
            activeGun.audioSource.maxDistance = activeGun.MaxSoundDistance;

            animator.SetTrigger("Holster Gun In");
        }
        else
        {
            isEquippingOrChangingGun = true;
            IsHolsterOut = true;

            animator.runtimeAnimatorController = gun.TPSGunController;

            rightIKGun.data.target = gun.holsterTarget.transform;
            rightIKGunHint.localPosition = gun.RightIKGunHintPosition;

            leftIKGun.data.target = gun.leftIKGunTarget.transform;
            leftIKMagGun.data.target = gun.gunIKMagTarget.transform;
            leftIKBoltGun.data.target = gun.gunIKBoltTarget.transform;

            magMultiParentConstraint.data.constrainedObject = gun.Mag.transform;
            magMultiParentTarget.SetParent(gun.magMultiParentTarget.transform);
            magMultiParentTarget.localPosition = Vector3.zero;
            magMultiParentTarget.localRotation = Quaternion.identity;

            animator.UnbindAllStreamHandles();
            animator.UnbindAllSceneHandles();

            rigBuilder.Build();
            animator.Rebind();

            SelectedGun = gun;

            animator.SetTrigger("Holster Gun Out");

        }
    }
}