Mouse event processing while drag&dropping?

Questions
#1

Does .mouseOverAction, .mouseEnterAction (and etc) functions not work while drag&drop operation is processed (so mouse key pressed)? What can be the solution if I would like to use mouse event processing while drag&dropping?

(
var win, sink, source;

Window.closeAll;
win = Window(bounds: Rect(300, 275, 200, 200));
win.front;
win.view.acceptsMouseOver_(true);

sink = DragSink(win, Rect(25, 110, 150, 65)).align_(\center).string_("DragSink").receiveDragHandler_({});

// not working while dragging
sink.mouseEnterAction_({
	sink.background_(Color.grey(0.8));
	"mouse entered DragSink".postln;
});

// not working while dragging
sink.mouseLeaveAction_({
	sink.background_(Color(219, 219, 219));
	"mouse leaved DragSink".postln;
});

source = DragSource(win, Rect(25, 25, 150, 65)).align_(\center).string_("DragSource");

source.beginDragAction_({
	"dragged".postln;
});

// not working with .beginDragAction
source.mouseUpAction_({
	"mouse up".postln;
});
)