Bug: behavior of "disable_topmost" has changed

I have been using Taskbar Tweaker for a long time.  I use it for the "disable_topmost" advanced option.  I set it to "2" to allow me to place windows on top of the taskbar.  Until recently, maximizing a window would make it fill the entire screen, covering the taskbar.  Now, after the latest Windows-10 update, maximizing a window makes if fill only the part of the screen above the taskbar.  (I can still drag a window on top of the taskbar, however).

Evidently, Microsoft has "fixed" something in the Windows 10 system that broke this feature.  Can it be restored to its previous functionality?

Thank you