Why visualElement.WorldToLocal(mousePosition) returns zero when visualElement is scaled by transform?

Hi There. I build an editor window with UIToolkit and it has zoom effect like what shader graph has. In previous versions on Unity, I mean 2021.1 and earlier I used MouseDownEvent.localMousePosition and it worked perfect in scaling but now I updated my project to 2021.2.7 and I think there is problem here. now MouseDownEvent.localMousePosition return zero when there is even a slight scaling and also visualElement.WorldToLocal(MouseDownEvent.mousePosition) have the same effect. Even I tested transform.matrix.inverse * MouseDownEvent.mousePosition and still it returns zero.

Can anyone please tell me what I'm doing wrong here? Thanks