Hello,
Please do this minor change:
1. Edit CreateDocx.php (Classes/Phpdocx/Create folder in the namespaces package).
2. Go to embedHTML method.
3. Replace the following line:
if (isset($value['attributes'])) {
by:
if (isset($value['attributes']) && $newNumberingDOM) {
And try again. A very similar change will be included in the next release of phpdocx to allows adding customListStyles with ol tags.
Regards.