Something like this should fix this issue (I didn't have time to try it, will do asap, just providing a quick workaround just in case this is critical)

Index: NoesisView.cs

--- NoesisView.cs (revision 12945)
+++ NoesisView.cs (working copy)
@@ -1190,8 +1190,8 @@

 private void UpdateActions(float t)
 {

• int x = 0;

• int y = 0;

• int x = int.MaxValue;

• int y = int.MaxValue;
  bool trackedPos = false;

   if (_trackedPositionAction?.activeControl != null && _trackedRotationAction?.activeControl != null)

  @@ -1216,9 +1216,10 @@
  x = (int)(worldPos.X / worldPos.W);
  y = (int)(worldPos.Y / worldPos.W);

• MouseMove(x, y);
  trackedPos = true;
  }

• MouseMove(x, y);
  }

   if (_trackedTriggerAction != null)

Hey, tested, works like a charm, thanks so much!

Hello, I noticed this fix alters how slider behaves if you click and drag, then go off UI element into empty space.
Before the fix if you went off UI while dragging the Thumb the value froze on current position.
After the fix the value of slider jumps to 0.
I don't think the new behavior is desired regarding the slider.