Hello, We have an application which uses the experimental feature: SKU sharing.
when testing our application we found that Shopify will make a request to /fetch_stock routinely and then proceeds to update the stores default location with the new inventory levels.
I assume the expected behaviour should be updating the inventory levels at the app's managed location.
I am also seeing this same behavior. If the product is stocked at the default location, then the quantity at the default location is set to the value returned by the fulfillment service callback-url/fetch-stock.json endpoint.