The Qt SVG renderer/parser somewhere messes up with inheritance.

Given following svg image:

<svg height="400" width="200">
<g visibility="hidden">
<rect x="10" y="10" width="100" height="100" fill="purple" />
<rect visibility="visible" x="10" y="120" width="100" height="100" fill="red" />
<rect x="10" y="230" width="100" height="100" fill="blue" />
<rect x="10" y="340" width="100" height="100" fill="orange" />
</g>
</svg>

The "visibility" property/attribute is inherited, but can be overridden for each child separately.

As for the SVG above, the complete group is hidden, except for the red rectangle.

https://jsfiddle.net/3v9cmo8k/1/

But in Qt, the SVG renders it differently: From the moment the visibility parameter is overridden, all following children are affected too.

See screenshot, opened the SVG above in the SvgViewer Qt Example