We are sorry to hear that you’re still having trouble with our plugin. Due to the nature of the issue, we’ll need to take a look at your setup. However, we are unable to do it here as this is a public forum.
So, if you have an active Yoast SEO Premium subscription or if you can consider buying one, we can investigate the issue further directly on your setup privately through email.
However, if you don’t wish to get the Yoast SEO Premium subscription, that’s completely fine. In this case, you’ll need to troubleshoot the issue further on your setup as we are literally out of any clue at this moment without taking a look at the setup. So, someone from the community might step forward as well who has experienced the issue or familiar with the parent/child breadcrumbs relationship.
Thanks for your understanding!