Example Syncfusion Diagram

Problem: Drag and drop two BPMN shapes into Lane 1 or Lane 2 and try to connect those shapes. When the port has the option set visibility: ej.diagrams.PortVisibility.Connect | ej.diagrams.PortVisibility.Hover, constraints: ej.diagrams.PortConstraints.Draw you can connect shapes directly from port, see pictures below.
No event is raised, e.g. connectionChange, targetPointChange, sourcePointChanged. When you drag connector from toolbar and when you try connect two shapes, events raised correctly.

Try like this. Events not raised:

Do not try like this. Events raised correctly:

Try like this. Events not raised:
Do not try like this. Events raised correctly: