Not only that but there wasn't even a notification on the dashboard for me after updating the OS that k3s were being replaced, I found out after updating when my apps wouldn't work. When did I update? About 2 weeks after the migration deadline. Had to rebuild my Plex, Jellyfin and Immich apps.
Don't get me wrong, I don't like notifications from the OS developer in my system, but that would've been a great heads up and a worthy exception. "Hey migrate your apps now or your shit will break" would've worked.