SVG toolbar icons are rendered all black

[Taxsola]

Aerilius has also stated some useful info about it.
but it was for win only, and 2019 so not sure how to proceed.
Will svg1.1 work SU17+ on Win and Mac? is it future proof? (about extensions)

Toolbar icon - SVG clipPath results in black background

The toolkit that SketchUp uses for its Windows UI supports only a subset of SVG: no gradients (ouch!) no filters (for smooth shadows) no embedded images (as work-around for the previous limitations) and no clip paths By comparison, different PDF standard versions (PDF/A-1 1.4 vs. Adobe’s non-standard PDF) have also varying limitations compared to SVG. As a work-around, you could: emulate the missing features (posterizing gradients to layered polygons of varying color, intersecting polygons …