Just some observation while I have been trying to figure this out.
I don’t think it just the screen space widgets I’ve got click events on actors also and when the virtual joystick is active they won’t even acknowledge the events. Have you seen this behaviour?
I’ve also noticed using the widget reflector debugging tool that when the virtual joystick is on the screen the widget covers the whole screen it visibility is set to visible, so the events are getting past it.
I have tried using the z-index of the widgets to pull them in front of the joysticks but to no avail.