[Inkscape-devel] "Convert CSS attributes to XML attributes" breaks rendering in external applications

Hi,

I have tried to submit a bug report via launchpad multiple times during the day but it seems to not like me today, thus I am submitting it via the ML.

When I save an optimized .svg with the option "Convert CSS attributes to XML attributes" enabled with Inkscape 0.91 (Ubuntu 16.04), any application that I have tested but Inkscape do not display some parts of an image with the resulting file. I managed to create a MWE that should be handy enough for a successful analysis.

Attached you can find the original Inkscape .svg and two optimized .svg files created with the CSS option turned on and off respectively. When the option is off then all applications render the dot fine, when it is on only Inkscape recognizes it.

KR