The issue is caused by package @angular/service-worker
Is this a regression?
No, I don't think so,
The Service Worker registration logs an error in the console when the it fails. I think that's confusing and it would be better to use the ErrorHandler which other parts of Angular use. That way Angular users could handle the error themselves.
🔬 Minimal Reproduction
As far as I know there is not really an easy way to reproduce this besides deploying a broken app. I hope it's okay to point to the source instead.