Mask from SVG not rendered properly, shows up fine in exported SVG or PDF

[Ion Dune]

OS: Windows 10 Enterprise Insider Preview
Inkscape Version: 0.91 r13725

I've got an SVG that uses a mask to create a gear shape out of a circle. The SVG renders fine in IE, Chrome, and codepen as seen here: http://codepen.io/iondune/pen/JGoeZN

The problem is that when I open the SVG in Inkscape, it appears as simply a white circle with no mask (though clicking on the shape indicates that the object is masked). If I export a PNG, I get the same unmasked results.

The weird part is that if I export an SVG or PDF out of Inkscape, the results look correct. Despite showing only a white circle in Inkscape, the exported PDF has the correct gear shape and if I view the exported SVG in anything but Inkscape it appears correct.

[su_v (suv-lp)]

Please add information about OS/platform and Inkscape version to the bug description, thank you.

To ease testing and triaging of the reported issue, the bug team would appreciate it if you could attach a test case (SVG file) directly to the bug report.

[su_v (suv-lp)]

Thank you for taking the time to file this report - the issue is known and already tracked in
* Bug #794472 “Only the first child of a mask is considered by Inkscape”
  https://bugs.launchpad.net/inkscape/+bug/794472

See also attached modified version of the test case which wraps the mask content with a group - it renders as expected in Inkscape 0.91 and current trunk (r14517).

Linking as duplicate to bug #794472.