A good crimp probably prevented that water intrusion. I wonder for semi-auto rounds like 9mm that are not crimped, if any water would have made it in.Stored reasonably well and no corrosion evident they are probably OK.
Recently had a 45 Colt round accidently get into my reloading to-be-cleaned pile. Ran for 45 minutes in my ultrasonic cleaner .
When I took it out and dried the outside I took it apart and there was no evidence of water intrusion at all. It was not worth it to me to re-assemble and fire just to see so I discarded the primer & powder but am guessing that it would have been OK.