Cannot add any apps to Security & Privacy preferences on Catalina
Since the update to Catalina, I can no longer add any apps to the mentioned Preferences pane. For example, when going to the Accessibility pane ("Allow the apps below to control your computer") and adding an app via the + button or by drag & drop from the Finder, the action is simply ignored and the list stays empty.
Has anyone seen this problem? Any idea to work around it?
MacBook Pro 13", macOS 10.15