There was a problem with this bug in that if the behavior in inkscape was the intended one, the xml (in particular when saving) was kept with the rx=0 attribute, making it fail on other renderers. Now inkscape will still ignore manually set "rx=0;ry≠0" attributes made by other editors (those should be rare). Fixed in trunk r15420, backport-proposed to .92.1
There was a problem with this bug in that if the behavior in inkscape was the intended one, the xml (in particular when saving) was kept with the rx=0 attribute, making it fail on other renderers. Now inkscape will still ignore manually set "rx=0;ry≠0" attributes made by other editors (those should be rare). Fixed in trunk r15420, backport-proposed to .92.1