Operating system: Windows-10-10.0.17763 64 Bits
Broken: version: 2.81 (sub 1), branch: master (modified), commit date: 2019-08-06 00:47, hash: rBdcbce4b92419
Short description of error
Blender Preferences > Themes > 'Reset to Default Value' will always return the color black and not the default color of the current selected theme, as I would expect it to do).
I don't know if this is a bug or a paper cut? Or if it is supposed to zero all color values, maybe the entry in the Menu should be renamed accordingly?