One of our users managed to find this interesting bug.
1. Create a GPO where you define favorites in a folder on the Favorites bar.
2. Brows to wherever and make a new favorite, save in "Favorites bar" or "other favorites".
3. Drag the new favorite and try to put it above the GPO-defined favorite folder.
This will make the favorite go invisible.
Open a new tab and go to the same favorite again, it will show as a saved favorite with a blue star.
4. Press the blue star, sometimes Edge will crash at this point, if not click the button again. It will usually crash within 4 attempts.
Can anyone confirm that this is a problem outside this environment?