You now hear about it when an approved commission is reversed

When revenue from one of your referrals is refunded, the commission resting on it is reversed — the money has not moved yet, so that stays automatic. What changed is that you are told: an approved commission being reversed now sends an email to your affiliate address, down the same path as the other four affiliate notifications. It used to happen in silence, with the figure in your dashboard changing and no way to find out why.

The email names the commission and its amount. On this notification the amount is labelled "Reversed" rather than "Amount", because the number is money you are not getting rather than money you are. Notifications are deduplicated per commission, so an approval and its reversal do not suppress one another — you see both.