selectedDeliveryOption is always null in the input to function

[SaeedYasin]

Here is the checkout, where I have tried to select a delivery option and reload checkout, it does seem to remember what delivery option I selected last time.

But selectedDeliveryOption in the input to the function is always null, no matter what I try, it is never set to any value other than null.

Is this a known issue? or am I doing it wrong some how? 👀