I straight up don't know what's going on here. Windows on my second monitor only are going full-length, to the point where they stretch to behind the taskbar, even though auto-hide is not on and never has been on on my unit. My main monitor works perfectly. I'm on the beta 22000.282, have been having nothing but issues with this update. Least stable beta update I've gotten outside that one that completely broke everyone's units for several hours.
e: And I have attempted to enable/disable auto-hide just to get it to fix itself but nothing changed.