The relationship between credit memo and order balance

It is unclear to me how credit memos and the order balance of the order are connected. I use 'Commerce' and 'Commerce Invoice'.

Use case: I want to cancel an order and refund the money.

If you refund the money in the order via the ‘Payments’ tab, the ‘Order balance’ quantity on the order overview page changes accordingly.

However, if you write a credit memo and then set this credit memo to ‘Pay’, the ‘Order balance’ amount on the order overview page is always set to 0, regardless of the amount of the credit memo. Regardless of whether I create and pay a credit note for a partial amount or the full amount of the order - after I click ‘Pay’ on the credit memo, the order balance is always 0.

What is the logic behind this behaviour of the the ‘Order balance’ amount?