collect-totals API call not updating the selected shippingMethod

[rikterbeek]

If you use the API endpoint

PUT /V1/guest-carts/{cartId}/collect-totals
{code}
 on an empty quote it all goes fine. But if you want to update the endpoint again to update the shippingMethod the old ShippingMethod is used for the totals.

### Preconditions
2.2.3

### Steps to reproduce
1. Call the PUT /V1/guest-carts/{cartId}/collect-totals endpoint with this data:
{code}
{"shippingMethodCode":"flatrate","shippingCarrierCode":"flatrate","paymentMethod":{"method":"checkmo"}}
{code}
1. Call the PUT /V1/guest-carts/{cartId}/collect-totals endpoint with this data:
{code}
{"shippingMethodCode":"freeshipping","shippingCarrierCode":"freeshipping","paymentMethod":{"method":"checkmo"}}

Expected result

1. Totals are updated with the new shippingMethod

Actual result

1. Totals are from the old shippingMethod.

It looks like it has to do that on the second call the setShippingAssignments() is not updated and this causes that the totals are using the old shippingMethod.

[magento-engcom-team]

Hi @rikterbeek. Thank you for your report.
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[magento-engcom-team]

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[larsroettig]

@magento-engcom-team give me 2.3-develop instance

[magento-engcom-team]

Hi @larsroettig. Thank you for your request. I'm working on Magento 2.3-develop instance for you

[magento-engcom-team]

Hi @larsroettig, here is your Magento instance.
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Login: admin Password: 123123q
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