There was no changes to the key handling, it’s the way the extension stores the keys. Again, I do not own it or plan to maintain it (not mine), and I do not think it was implemented correctly to begin with. If you search for the issues with extension loosing data on iOS upgrade, you’ll see plenty of devs complaining. Local storage of the browser is not how you supposed to store the data to persist for a longer time, so you get these issues.