What are you trying to achieve?

When running FulfillmentReturnProducts mutation, existing fulfillment is being deleted (in case when all products from fulfillment are returned).

This leads to data loss, because all metadata and tracking number are deleted with the fulfillment

Steps to reproduce the problem

1. Create order with fulfillment (one or more)
2. Assign tracking number and metadata to a fulfillment
3. Return all items from given fulfillment (with FulfillmentReturnProducts mutation)
4. Tracking number and metadata is lost

What did you expect to happen?

Data should not be lost when products are returned. Maybe empty fulfillment could be kept after returning the products?

Logs

No response

Environment

Saleor version: 3.21.0-a.0