Correct, I get a style definition for a black fill in 28.4.1, but none in 27.9:
<?xml version="1.0" encoding="UTF-8"?>
<svg id="a" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 267.656 267.656">
<defs>
<style>.b{fill:#000;stroke-width:0px;}</style>
</defs>
<circle class="b" cx="133.828" cy="133.828" r="133.828"/>
</svg>
I know that the Save As SVG code was changed in 28.4, but there may have been other changes in Export As that I'm unaware of. I will try and find out more.
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