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I think there is a python based font module that does validation if I am remembering correctly.
If the font metrics for height and descenders are not correct you will see a partial line. To make things more difficult there are cases where height includes ascender and decenders and others where they do not.
Just try replacing the font with a known good font, and if theproblem goes away, the issue is with the font (bad or missing font metric data tables).
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