Bad quality when using Svg.Save with scale below certain threshold

[jpodpro]

I'm generating svg code for some icons and using this library to dynamically convert them to png. Scaling works fine to a certain point but using smaller values beyond that point results in an image that is substantially worse in quality and ultimately appears wrong. I have tried starting with a smaller SVG image but it doesn't seem to help. Something fundamentally changes when trying to render my icons below 39 pixels.

Scaling to 39 pixels high:

Scaling to 38 pixels high:

The white border is clearly getting lost at this size which is unexpected.

Here is the SVG code without the inner icon graphic as that part is not the problem.

<svg version="1.2" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 500 609" width="500" height="609">
    <defs>
        <filter id="shadow" style="color-interpolation-filters:sRGB;" x="-100%" y="-100%" width="300%" height="400%">
            <feFlood flood-opacity="1" flood-color="rgb(31 40 50 / 1)" result="flood" />
            <feComposite in="flood" in2="SourceGraphic" operator="in" result="comp" />
            <feOffset dx="3" dy="15" result="offset" />
            <feGaussianBlur in="offset" stdDeviation="20" result="blur" />
            <feBlend in="SourceGraphic" in2="blur" mode="normal" />
        </filter>
        <filter id="stroke-inside" x='-50%' y='-50%' width='200%' height='200%'>            
            <feFlood flood-color="#FFF" result="inside-color"/>
            <feComposite in2="SourceAlpha" operator="in" result="inside-stroke"/>            
            <feMorphology in="SourceAlpha" radius="8" />

            <feComposite in="SourceGraphic" operator="in" result="fill-area"/>

            <feMerge>
              <feMergeNode in="inside-stroke"/>
              <feMergeNode in="fill-area"/>
            </feMerge>
        </filter>
    </defs>
    <style>
        .marker{ fill:#000000; fill-opacity:1; filter:url(#stroke-inside); } 
        .marker-shadow{ filter:url(#shadow); stroke:#444; stroke-width:12px; } 
    </style>
    <path class="marker-shadow" d="m228 91.1c-2.5 0.5-8.3 1.6-13 2.5-4.7 0.9-13.8 3.3-20.3 5.5-6.4 2.1-16.5 6.3-22.5 9.3-5.9 3-14.6 8-19.4 11.3-4.8 3.2-12.6 9.2-17.4 13.3-4.9 4.1-12.1 11.3-16.2 16-4.1 4.7-10.7 13.4-14.8 19.5-4 6-9.3 15.3-11.8 20.5-2.5 5.2-6.1 14.2-8 20-2 5.8-4.4 14.8-5.5 20-1.1 5.2-2.5 13.9-3 19.2-0.6 5.4-1.1 12.9-1.1 16.8 0 3.8 0.7 11.6 1.5 17.2 0.9 5.7 2.7 14.8 4.2 20.3 1.4 5.5 4.4 14.7 6.6 20.5 2.2 5.8 7 16.3 10.7 23.5 3.6 7.1 10.2 18.6 14.5 25.5 4.4 6.9 12.7 18.8 18.5 26.5 5.7 7.7 14.9 19.2 20.3 25.5 5.5 6.3 15.1 17.1 21.6 23.9 6.4 6.9 19 19.4 28.1 27.9 9.1 8.5 23.1 21 31.2 27.8 10.3 8.6 15.6 12.4 17.3 12.4 1.4 0 4-1 5.7-2.3 1.8-1.2 8-6.2 13.8-11 5.8-4.9 18.1-15.9 27.4-24.5 9.3-8.7 22.8-22 30-29.7 7.2-7.7 16.9-18.5 21.7-24 4.7-5.5 11.8-14.3 15.9-19.5 4.1-5.2 11.6-15.6 16.6-23 5-7.4 12.2-18.9 15.9-25.5 3.7-6.6 8.6-16.3 11-21.5 2.3-5.2 5.7-13.6 7.4-18.5 1.8-5 4.1-12.6 5.2-17 1.1-4.4 2.7-12.5 3.5-18 0.7-5.5 1.4-13.5 1.4-17.8 0-4.2-0.7-13-1.5-19.5-0.9-6.4-2.7-16.2-4.1-21.7-1.4-5.5-4.1-14.3-6.1-19.5-1.9-5.2-5.7-13.8-8.5-19-2.8-5.2-7.8-13.5-11.2-18.4-3.3-4.9-9.5-12.8-13.6-17.5-4.1-4.7-11.1-11.6-15.5-15.4-4.4-3.7-12.1-9.5-17-12.9-5-3.3-13.7-8.4-19.5-11.3-5.8-2.9-14.6-6.7-19.5-8.4-5-1.8-11.5-3.8-14.5-4.6-3-0.8-10.8-2.3-17.3-3.5-8.8-1.5-15.7-2-28-1.9-8.9 0.1-18.2 0.5-20.7 1z"/>
    <path class="marker" d="m228 91.1c-2.5 0.5-8.3 1.6-13 2.5-4.7 0.9-13.8 3.3-20.3 5.5-6.4 2.1-16.5 6.3-22.5 9.3-5.9 3-14.6 8-19.4 11.3-4.8 3.2-12.6 9.2-17.4 13.3-4.9 4.1-12.1 11.3-16.2 16-4.1 4.7-10.7 13.4-14.8 19.5-4 6-9.3 15.3-11.8 20.5-2.5 5.2-6.1 14.2-8 20-2 5.8-4.4 14.8-5.5 20-1.1 5.2-2.5 13.9-3 19.2-0.6 5.4-1.1 12.9-1.1 16.8 0 3.8 0.7 11.6 1.5 17.2 0.9 5.7 2.7 14.8 4.2 20.3 1.4 5.5 4.4 14.7 6.6 20.5 2.2 5.8 7 16.3 10.7 23.5 3.6 7.1 10.2 18.6 14.5 25.5 4.4 6.9 12.7 18.8 18.5 26.5 5.7 7.7 14.9 19.2 20.3 25.5 5.5 6.3 15.1 17.1 21.6 23.9 6.4 6.9 19 19.4 28.1 27.9 9.1 8.5 23.1 21 31.2 27.8 10.3 8.6 15.6 12.4 17.3 12.4 1.4 0 4-1 5.7-2.3 1.8-1.2 8-6.2 13.8-11 5.8-4.9 18.1-15.9 27.4-24.5 9.3-8.7 22.8-22 30-29.7 7.2-7.7 16.9-18.5 21.7-24 4.7-5.5 11.8-14.3 15.9-19.5 4.1-5.2 11.6-15.6 16.6-23 5-7.4 12.2-18.9 15.9-25.5 3.7-6.6 8.6-16.3 11-21.5 2.3-5.2 5.7-13.6 7.4-18.5 1.8-5 4.1-12.6 5.2-17 1.1-4.4 2.7-12.5 3.5-18 0.7-5.5 1.4-13.5 1.4-17.8 0-4.2-0.7-13-1.5-19.5-0.9-6.4-2.7-16.2-4.1-21.7-1.4-5.5-4.1-14.3-6.1-19.5-1.9-5.2-5.7-13.8-8.5-19-2.8-5.2-7.8-13.5-11.2-18.4-3.3-4.9-9.5-12.8-13.6-17.5-4.1-4.7-11.1-11.6-15.5-15.4-4.4-3.7-12.1-9.5-17-12.9-5-3.3-13.7-8.4-19.5-11.3-5.8-2.9-14.6-6.7-19.5-8.4-5-1.8-11.5-3.8-14.5-4.6-3-0.8-10.8-2.3-17.3-3.5-8.8-1.5-15.7-2-28-1.9-8.9 0.1-18.2 0.5-20.7 1z"/>
</svg>

[jpodpro]

Note that, like increasing the scale, increasing the feMorphology radius within the stroke-inside filter above a certain threshold also reaches a point where the issue stops happening. However this isn't exactly a fix as that increases the thickness of the stroke beyond where I would prefer it to be. At a certain thickness and scale the resize begins to become problematic.