I see that too. But I think it might just be displaying the horizontal resolution twice. i.e. setting a value for the vertical resolution does work, it just isn’t displayed properly.
i.e. setting the dimensions in v1.84.0rc5 and then opening monitor centre in v 1.83.04 standalone shows the horizontal and vertical values as they were entered. So v1.84.0rc5 appears to set the vertical value correctly but just can’t display it.