We use our own version of EditInteractiveOverlay called SnapEditInteractiveOverlay. Recently vertex control points have stopped displaying (apart from one). The normal behaviours, such as double clicking on a point to delete it works but no control point is displayed. Any thoughts on why this might be happening?
This is how an feature in edit mode looks:
P.S. I did try overriding CalculateVertexControlPointsCore(Feature) as a test and the expected number of points is being returned.