When using compass radial-gradient mixin with $experimental-support-for-svg enabled it produces incorrect svg image where radial gradient radius is set to 100 instead of 100%.
<?xml version="1.0" encoding="utf-8"?>
<svg version="1.1" xmlns="http://www.w3.org/2000/svg">
<defs>
<radialGradient id="grad" gradientUnits="userSpaceOnUse" cx="10%" cy="0" r="100">
<stop offset="0%" stop-color="rgba(137, 111, 82, 0.94)"/>
<stop offset="20%" stop-color="rgba(194, 123, 108, 0.94)"/>
<stop offset="100%" stop-color="rgba(238, 231, 189, 0.94)"/>
</radialGradient>
</defs>
<rect x="0" y="0" width="100%" height="100%" fill="url(#grad)" />
</svg>
The fix is to change 100 to 100%.
I am going to learn how to contribute to your repo and probably fix it by myself.