Semi-maximization works, and windows are still draggable if you use the traditional middle/right click on the maximize button.
What you're doing though isn't really semi-maximize. Ctrl+Super+Left/Right means to fill half the screen. So it might be an intentional design decision that state is not movable.
I know this is different to how it works in Unity7, but it might not be a bug.
Semi-maximization works, and windows are still draggable if you use the traditional middle/right click on the maximize button.
What you're doing though isn't really semi-maximize. Ctrl+Super+ Left/Right means to fill half the screen. So it might be an intentional design decision that state is not movable.
I know this is different to how it works in Unity7, but it might not be a bug.