Although control is set to Pen Tilt in the Brush Settings for Angle Jitter, the angle of the brush tip remains constant. It only changes when you make a stroke, yet stays at the same angle even if the pen tilts in a different direction during that stroke.
This issue comes up with the latest update of Photoshop (v21.1, Windows 10), on both a Cintiq 22HD & a Cintiq Pro 24" (Wacom driver 6.3.38-2).