Selected the photo, selected Local Adjustments, right click, select Auto Mask, “painted” a portion of the photo, selected Color in the Equalizer and moved Hue: Very, very faint color change, almost nothing.
The Brush and Control Points behave the same way.
The same process on a color photo does cause pronounced color changes.
Shouldn’t this be expected behavior? A black and white photo is desaturated and hence has a radius of 0 in the HSL color space. Rotating the hue around the centre with a radius of 0 does not change anything: