<p>I presume you are using the default colour scheme where text is black, so inverting it is white and the background is black.</p>
<p>But for printing the background is deliberately forced to white to avoid emptying the black toner cartridges or ink tanks by printing the whole background black.  So you get white on white, and as PDF is a faithful(ish) representation of the printed page it does the same.</p>
<p>So this is the intended result.</p>

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