If bold is not displaying, that could be an issue with the font engine (which on linux is free-type). If an actual font does not exist, it is approximated by the font-engine by the next closest font or size but not always correctly.
Try changing the font to a font that you know actually exists on your system. Then change the font-size to a valid font size in px so that no approximations by the font engine is needed. Then toggle font-weight bold to normal and back to see if there is a difference. As internally font weight is kept as a number that can vary in meaning across font foundaries.
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