Shopify discount code stacking error today, how can I catch it before customers do?

A bundle campaign went live on our DTC site today. During my checkout testing, I discovered that discount codes were stacking with automatic discounts, causing some combinations to result in negative gross margins. Fortunately, I hadn't turned on all the ads yet. I first checked the combination rules in Shopify discount settings, then checked if the subscription app and bundle app also had…