Watchlist displays markers with 'Group by page' option according to the description: "Changes to pages you haven't visited since the changes occurred are in bold, with solid markers". RC page does not display markers 'Group by page'.
However, in monobook skin, markers have different colors to additionally convey information about a Watched page. Discarding colored markers with 'Group by page' may deprive users of that additional info.
1. In betalabs change the skin to monobook and go to RC page with new filters enabled.
2. On RC page results will be displayed with markers - e.g.
{F9653307}
3. Enable 'Grouped results by page' option. The grouped results will be displayed without markers - e.g. {F9653253}
Without filters enabled, 'Grouped by page' option displays the markers:
{F9653323}