Hi there,
Thank you so much for getting in touch, we really appreciate your time.
Might I kindly ask if you have both WP Google Maps and WP Google Maps Pro active?
The default marker icon setting should still be present and has not been removed so if I could kindly ask you to perhaps take a screenshot of what you are seeing at your end via the Maps -> Map Editor -> Advanced Settings tab?
I look forward to hearing back from you.
Kindest Regards,
Steven De Beer