It can happen b/c the systems continue to analyze more/new info after the video is live. We've seen similar reports about icons changing colors right after the video is published -- we'll share this additional example with the team who is working on improving it. Thanks!
Yea it just looks at additional info once its published (vs when its private) so this can happen -- we are working to improve the experience. There's also a new monetization pilot program, we'll DM you some info in case you're interested. It may be helpful for your channel.