I've been through previous threads on Drag n Drop and tried options suggested but no luck

My Final option is to check with Support team.
Below is the code snippet i am using for drag n drop .
Same old Logic of buttonDown,Mouse.MoveTo and ButtonUp
public void RemoveBlockFromDesignCanvas(string blockName)
{
WaitforDesignSpaceResults();
Mouse.Click(FindElementV2_x("RxPathDesignSpaceUpperDesignCanvas"));
ScrollHorizontalOnDesignCanvas();
Mouse.MoveTo(FindElementV2_x("RxPathDesignSpaceDesignCanvasBlockName",blockName));
Mouse.ButtonDown(MouseButtons.Left);
Mouse.MoveTo(FindElementV2_x("RxPathDesignSpaceDesignLabel"));
Mouse.ButtonUp(MouseButtons.Left);
designPageMethods.ClickUpperDesignCanvas();
}
This code is throwing me an exception at Mouse.MoveTo(FindElementV2_x("RxPathDesignSpaceDesignLabel")); as it is unable to find the element, when manually checked through spy i am able to find the element

I am using drag n drop across the application but it is only failing in this method. I am attaching the snapshot for those 2 elements Source(Element) and destination(Element). I have observed that draggable attribute is set to False but i am still able to drag manually

Hope i have provided enough information for you to suggest.