StoreKit testing bug - SKPayment quantity of more than 1 is not supported?

I've set up StoreKit local testing environment, but observing an issue with SKMutablePayment quantity property. Changing quantity to something other than 1 doesn't seem to register with the system when performing a purchase within Local environment.
Payment UI has a price for a single consumable and after user confirms the payment, payment quantity on the transaction changes to 1.
Does anyone know a workaround to this problem?

Also, there is an issue with "Editor ->Default Localization" where localization other than English results in SKProduct.priceLocal without a regionCode.
StoreKit testing bug - SKPayment quantity of more than 1 is not supported?
 
 
Q