This is essentially an updated version for Python 3 of the older tool found here: https://github.com/glutanimate/image-occlusion-enhanced/tree/master/tools/io2-svg-fix
Older versions of the image occlusion add-on created malformed SVG files that resulted in the obscured "question area" being the same color as the other rectangles. This script fixes those images.
Usage
Place the svgfix.py file in the profile directory (e.g. C:\Users\Name\AppData\Roaming\Anki2\User 1), next to the collection.media folder. Run the script with python3 svgfix.py.