(yes I have the latest version: 1.7.0)
Create an object, say a rectangle. Set its fill to none and its stroke to pure black (rgb 0,0,0). Then try to add style from selection in the styles panel: nothing happens.
Now change the stroke colour ever so slightly: e.g. rgb 0,1,0. This is so close to black as to be imperceptible, but it is NOT black. Now adding style from selection does work.