Trouble with simple conditional activation group

I have an activation group with a simple condition: "Window Name begins with 'Web Inspector'" and it contains a keyboard shortcut that I'm trying to use with Safari.

The condition editor shows green when the web inspector window is active, and not green for the main safari window. And the keyboard shortcut works as expected for the web inspector.

However, the shortcut also runs on the main Safari window for some reason.

Any ideas?