Does the v4 popup not select multiple features?
With properties like `featureCount` and `features`, and feature pagination in popup's node, I would assume it does. However, with multiple feature layers (with overlapping polygons), it only selects features from the top most layer. And with points, when zoomed out and clicking on what should be 10s if not 100s of points, still only one feature is selected. This behavior can be tested on this api example map (Multiple popup elements | ArcGIS API for JavaScript 4.3 ) by zooming way out and clicking.
Any info on this would be appreciated. Thanks.