Discount not selected by default when using payment link with discount preset

[MarcMogdanz]

Description

When creating a payment link with a discount selected by default, it will automatically apply it and also show it in the price breakdown, but it won't be selected in the discount input.

Current Behavior

Currently the preselected discount is not being shown in the discount input.

Expected Behavior

The discount should be selected in the discount input.

Screenshots

When opening the payment URL you can see the discount being properly applied, but the discount input is empty:

This is how it should look like: