To clarify, many scripts that reference specific sheets, or that rely on the traditional sheet architecture, will not work on newer sheets without modification. These scripts must be updated to support the Beacon Architecture, and this is not a trivial change. Sheets that use Demiplane are currently not addressable via the API. I have heard that a fix is on the long-term roadmap, but given that this is a heavy lift, I would not expect it anytime soon. Most other types of scripts work fine on either the Legacy or Modern engine. @FFR: Not sure what is bolluxed with On My Turn. I can investigate.