It appears if there is a rotation in the SVG such as <svg transform="rotate(180, 0, 0)" the SVG will not display properly within xnview. Attached are two SVG's, one working fine (1), and not working (2). Note that browsers can display both fine.
I uploaded them as "jpg"s as you cannot attach SVG's. Just rename the extension to SVG to see.
edit: I cannot upload the SVG's here but the difference is indeed the rotation transform.
SVG's not displaying properly
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