In Dashboards Beta, if you have a map with point data with multiple points at the same location, but use Category Selector to filter to only show one at a time, it successfully filters the map to only show the selected features. However, if you click on the selected feature it still shows the popup for all features, not just the filtered ones. To test, try making a webmap with a time-enabled layer like this one:
Then use that webmap in a Beta Dashboard. Set up a Category Selector based on either the ValidDate field or LocalTimeString and set the Action to filter the map based on its selection. Test the Selector – it should successfully filter the points, but if you click on one it will say “1 of 24”. If it were working correctly it would only show the active feature.