All system colors are displayed incorrectly on the popover view.
Those are the same views present as a popover in light and dark mode.
And those are the same views present as modal.
And there is also a problem that when the popover is presented, switching to dark/light mode will not change the appearance. That affected all system apps.
The following screenshot is already in dark mode.
All those problem are occured on iOS 26 beta 3.