Photoshop 23.0.1
MacOS 11.6.1
When changing the Ruler units to Percent, the wrong units display on the vertical/left ruler. The horizontal/top ruler works normally, and other units (Pixels, Inches, Cm, etc.) seem to work normally.
I was able to find a workaround by unclicking Prefs>Tech Previews>Enable Native Rulers, but it is clearly a bug that should be addressed.