I’m running the latest version of Drafts (29.0.01) on Big Sur, but I keep seeing this error:
Drafts-WidgetExtension-OSX cannot be opened because of a problem.
Check with the developer to make sure Drafts-WidgetExtension-OSX works with this version of macOS. You may need to reinstall the application. Be sure to install any available updates for the application and macOS.
I’ve removed the app and reinstalled, but the error is persistent. Unfortunately I’m not yet able to update to Monterey. I’ve sent the error report to Apple via the dialog, not sure how useful that is on the Drafts development side!