Correction: Inkscape actually *should* support the shape rendering option, see https://bugs.launchpad.net/inkscape/+bug/170356/comments/21 and the relevant commit https://gitlab.com/inkscape/inkscape/commit/32ef25632164e5af8766a5364400b579edde4ebf
So this is in fact a bug.
Correction: Inkscape actually *should* support the shape rendering option, see /bugs.launchpad .net/inkscape/ +bug/170356/ comments/ 21 /gitlab. com/inkscape/ inkscape/ commit/ 32ef25632164e5a f8766a5364400b5 79edde4ebf
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and the relevant commit
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So this is in fact a bug.