compound path drawing seems to fail for any circular subpath

[Gambloide]

Preface
I am very inexperienced when it comes to parsing svg-definitions and am not really familiar with the spec, so I apologize if I am completely misunderstanding what is happening here or I use the wrong terminology.

Issue
Any circular sub-path enclosed by an arbitrary different path is not rendered properly.
Examples (left svg rendered by browser, right by oksvg):


These examples only use a path-object with z, Z, m, M and a operators inside a viewbox.

Steps to Reproduce
Add either the following minimal example (circle with donut-hole) or any svg from fontawesome.com with a hole as a svg-file to the existing testdata folder of oksvg add the reference to the file in svgdraw_test.go:

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path fill="#000000" d="M256 512a256 256 0 1 0 0-512 256 256 0 1 0 0 512zm0-352a96 96 0 1 1 0 192 96 96 0 1 1 0-192z"/></svg>

Specifically tested and incorrectly rendered files from fontawesome:

• https://fontawesome.com/icons/gear?f=classic&s=solid
• https://fontawesome.com/icons/wrench?f=classic&s=solid
• https://fontawesome.com/icons/sliders?f=classic&s=solid
• https://fontawesome.com/icons/plug-circle-check?f=classic&s=solid
• https://fontawesome.com/icons/plug-circle-xmark?f=classic&s=solid

Steps Taken
I got a local development environment for oksvg running and fiddled with the svg-files themselves as well as the code handling z, Z, m and M. I assumed it might be an edge-case for handling the closing of arcs that was misbehaving, but failed to identify anything meaningful.

Notes

• This is not a rendering error in VSCode. The generated png-files look identical in any other program.
• I checked https://github.com/srwiley/oksvg/blob/master/doc/SVG_Element_List.txt and assured only supported features are used in these files.
• I came across this because I am developing an application with https://github.com/fyne-io/fyne, which uses oksvg. When I tried to add more icons to the existing selection, the icons I added rendered incorrectly with the same issues as shown above.