Ctrl+Shift+Tab no workey?

Hi there,

Ctrl+Tab ( scrolling through open windows and plugins, forwards ) works as expected, but Ctrl+Shift+Tab only goes back 1 opened window

1.empty project
2.add 3 effects in mixer ( leave all windows open )
3.try Ctrl+Tab to bring all windows to front one-by-one
4.start scrolling windows backwards with Ctrl+Shift+Tab
5.realize Ctrl+Shift+Tab only opens 1 window back, while Ctrl+Tab will bring all windows to front