Depends on D18288
Hour hand did not had shadow.
Now it has.
From the linked bug report (and your screenshot)
You're right about the typo, but it doesn't seem that trivial. The shadow shadow appears all offset (on the default breeze theme at least)
The hour hand shadow starts several px below the hour hand
Well, you open it up in Inkscape and fix it in there. I know that's not particularly helpful, but I can't tell you exactly what you need to do unless you ask me a specific question about how to do something. This might be the wrong approach though. If your goal is simply to make the shadow move with the hand in a way that has a consistent light direction, you'll need to rotate and translate the shadow depending on the time in the code here. I think the light source should be in the top left coming down diagonally to the bottom right since that's how it is for most Breeze icons.
so, the svg is fine, if one removes all anchors.margins the shadows graphics are all beneath the hands exactly.
so can it be tried to just adjust those anchors margins to a small enough value?
units.smallSpacing * [some value]
I'm afraid this won't work, since it will result in fractional pixel values and blurry edges. For this, you need to just hardcode the number of pixels.