The Catholic Church has issued a warning to its clergy in Washington state: Any priest who complies with a new law requiring the reporting of child abuse confessions to authorities will be excommunicated.
https://www.newsweek.com/catholic-church-excommunicate-priests-following-new-us-state-law-2069039
That does not appear to be true, unless the crime is being planned or in progress.
But even if it somehow did, you’d effectively be demanding a priest self-incriminate by admitting to the contents of a confession.
It’s called “accessory after the fact”, and they wouldn’t be guilty of it if they report it, that’s the whole point of reporting it.
Imagine believing this given the current state of the criminal justice system