If it were me, I’d make up the spend as soon as possible. I mean, there are three possibilities, right? One, they automatically revoke the bonus. Two, they don’t care, and you’ll be fine. Neither of those you can do anything about. And three, either they automatically look for makeup spend (seems unlikely), or an actual person reviews the situation and decides in their discretion. In the latter case, showing you’ve made up the spend would at least be a show of good faith.