Stroke interpolation in Glyphs 3

I’m trying out the stroke feature of Glyphs 3.0.2. I’m trying to interpolate a stroke with two masters, Light weight 10, (W:10, H:4) and Black weight 200, (W:200, H:180). Vertical strokes interpolate as expected, but horizontal lines stays at the light weight (4). Is this not supposed to work or am I doing something wrong?

Can you send me the file?

Yes, here is a file with an example:

Thanks for the file. I fixed it.

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