weight and height are needed for WebKit (Safari) to render the icons properly, I wrote up the detail in #8. I suggest updating to use the right dimensions instead? Quick way to find out what they…
I was confused: https://nixos.org/manual/nix/stable/command-ref/conf-file#file-format shows that both extra-substituters and substituters work, extra-... means "append to list instead of replacing"
Further detail: the SVG 2 spec introduced the auto value for width/height, to calculate the viewport dimensions based on content dimensions: https://www.w3.org/TR/SVG2/embedded.html#Placement
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Seems to render correctly in {firefox,chrome}x{nixos,android,macos}, but fails on Safari+macOS and all browsers on iOS (per Apple policy they're forced to use Safari's rendering engine).
Poking…