Unity does not change the size of the window

When I set the screen resolution from fullscreen Screen.SetResolution(width, height, false) window does not change size and stay 1920x1080, but image changed, and it becomes stretched. I dont change screen resolution anywhere else. Something force my window size. It's only a issue when I try set window resolution from fullscreen.

This problem has appeared in Unity 2017.1.0f3, I did not have this problem before in Unity 5.6