The Executive Summary Report isn't listing certain people as options for the Publisher filter, but both names should be there.
Studio | Insights
When searching for Publishers in a report, certain users are not coming up when using the search bar to look up their names. Users can still be found by manually scrolling through the list, but they will not appear when being searched.
This issue has now been resolved by Product Engineers and has been moved to Complete on the Known Issues Tracker. (Issue ID: CSUP-2323)