In Edwards v. Vannoy, Kagan criticizes Kavanaugh for judicial scorekeeping.

… Thus, in a single page, Kavanaugh wiped out decades of precedent allowing new rules of criminal procedure to apply retroactively. And he did not offer the usual justifications that the court provides when reversing its past decisions. Instead, he asserted that he was actually helping criminal defendants…

https://slate.com/news-and-politics/2021/05/edwards-vannoy-kagan-kavanaugh-scorekeeping.html