Regression: a shape element with no color some opacity is rendering as solid black now

[dnfield]

E.g.

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 264 264">
  <rect width="264" height="264" fill="lightblue"/>
  <path d="M184.32,121.12H79.38v8H184.32Z" opacity="0.1" />
</svg>

No longer renders correctly after #306

Unfortunately there was no test covering this.

/cc @pento

[stact]

@pento @dnfield it seems that it's fixed with this shared sample.

But got some unexpected effect on this sample: https://avataaars.io/