Heads up, found at least one match for 2019 from a dataset I'm working with.

That doesn’t set an upper bound on when the breach happened, it sets a lower bound. Old email addresses aren’t deleted by whoever had them. It just means it contains data from at least 2014, up to and including 2019.

The email notification doesnt list the emails impacted. Do you need to rerun the full report to get the details?

If you run the domain report manually on the HIBP website you get the actual email addresses involved.