What is the root cause?

https://github.com/kodbruket/magento2-vsf-kco/blob/master/src/module-vsf-kco/Plugin/Quote/Model/Cart/ShippingMethodConverter/ModelToDataObject.php#L43

@indiebytes I found that you note here as a work-around solution. Could you please explain me and @phongphanmage so that we could think a bout a better solution for this case?