You can try importing the SVG into the free program InkScape and re-exporting (it has more than one flavor of SVG to try). Or you can use EMF, a format with a longer history and better support in Office.
You can report this bug by choose File>Feedback>Send a Frown. Describe the problem so it can be reproduced. Submitting sends the report to the Word programming team. They are unlikely to reply.