Well you can’t sign new certs (with the current date) with an expired root/intermediate cert, but the root/intermediate cert expiring doesn’t strictly invalidate the already signed certs.
But I was more talking about the end-user certificates in the previous comment.
Recently learned that root CA don’t actually expire. Yes, they have an expiration date, but nothing pays attention to it for a CA.
Well you can’t sign new certs (with the current date) with an expired root/intermediate cert, but the root/intermediate cert expiring doesn’t strictly invalidate the already signed certs.
But I was more talking about the end-user certificates in the previous comment.