@Rory, it seems the 3.10.0 version was not signed for Mac - see Version 3.10.0 won't run in macOS since the app is not notarized · Issue #7671 · OpenRefine/OpenRefine · GitHub
@Martin I've been trying to look into this but I haven't seen any significant changes to this part of the workflow. However, I don't think I have access to any of the Apple code signing details/secrets so I can't check that step of the process.