Stream Deck update breaks Keyboard Maestro

Keyboard Maestro works great running under Stream Deck 5.3.1. I recently purchased a Stream Deck + (with knobs), and it requires the latest version of Stream Deck (6.1). When I install it, Keyboard Maestro plugins - anything that uses Apple Script - completely breaks, and I end up with buttons that have a big question mark with the text "RunAppleScript" under it. Is there a fix?

Just a stab in the dark: do you have to reinstall the KM / KM Link plugin?