I have done all that many times, that is not the solution. Every time I save the customizer layout the @import font rule is gone, only when I set it again (to the same value) it is saves in the custom theme less file. Also: I have Dosis as the header font and Open sans as the body font. There is only an @import rule for Dosis font, not for Open sans, so something is different between these two fonts.

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