If God is punishing in anyway, temporal, whatever you want to call it, sins that are forgiven, then He is an unjust god.
If they are forgiven, there’s no punishment.
If there’s punishment, then they have not been forgiven. The person is then trying to work off the debt owed for the sin committed. And that’s not forgiveness.
Forgiveness is wiping the slate clean, period. Releasing the debt owed so the person does not have to answer for it ever again.
Not punishing. Purifying.