I met problem when I am picking coordinates in 2D SceneMode
You can see the Picking demo of Sandcastle below: Double click the billboard I add in the demo, and you will find the coordinate label is far away from the mouse.
I think the problem is in
var cartesian = viewer.camera.pickEllipsoid(movement.endPosition, scene.globe.ellipsoid);
There must something wrong when converting windowPosition to cartographic
Any help appreciated.