My data was in the 500px breach. Every time I check for breaches against my email address on HIBP, this comes up. I use random passwords so I am not concerned about the leak, but I do make sure to change passwords once I am notified of a leak. Once the list of breaches becomes long enough, I may not remember whether I have dealt with a specific issue reported. It would be good to have a mode where I can log in and check the issues that I have dealt with, so the next time I login and check I can see just the new breaches to deal with.

It is possible for the user to handle that entirely on their end by checking the last time the pwd was changed in the password manager, but it can be tedious when the list is long...