1. Download repro missions and extract to your profile\missions
2. Open either of the missions.
3. Preview and notice how it works fine with the AND type. The GL waits at the second waypoint (Visualized by red sphere), until both units have reached their waypoints/triggers.
4. Exit the preview, and change the type of the second waypoint of the GL (The synchronized one) to type "OR", and preview.
5. Notice how it completes all its waypoints instantly without waiting for synchronization.