The issue is really minor - invert=1 in url will not affect UI and cannot be saved as a part of saved filters.
- On RC page select any filter (s).
- Click on Namespace filter button and without selecting any namespace, click on 'Exclude selected'. The button becomes active and invert=1 is added to the url.
- Click again on 'Exclude selected' - it becomes inactive, but url would still have invert=1.