Hello,
We apologize for the inconvenience you’ve experienced with the Strip Category Base option in Rank Math. We understand that this has caused a significant issue with your parent product category URLs, and we’re sorry for the frustration it has caused.
We appreciate you bringing this to our attention. We’ll make sure to escalate this issue to our development team for further investigation. In the meantime, we recommend disabling the Strip Category Base option to restore your parent product category URLs.
If you need further assistance or have any other questions, please feel free to let us know.
Sources:
WordPress Permalink Structure & Changing Individual URLs » Rank Math
How to Optimize a Category Page » Rank Math
Rank Math General Settings
Thank you for escalating this. Disabling the strip category base did not fix the issue. I had to rename all of my parent product category urls to get them working again. Even the dynamically linked ones would not work until the urls were renamed. Hopefully that can figure out what happened. I’d be happy to provide access to the site if they’d like to take a look too.
Hello,
Thank you for your patience.
Please share the affected URLs (old and new) so we can check as well.
Also, we might need to take a closer look at the settings. Please edit the first post on this ticket and include your WordPress & FTP logins in the designated Sensitive Data section.
Please do take a complete backup of your website before sharing the information with us.

It is completely secure and only our support staff has access to that section. If you want, you can use the below plugin to generate a temporary login URL to your website and share that with us instead:
https://wordpress.org/plugins/temporary-login-without-password/
You can use the above plugin in conjunction with the WP Security Audit Log to monitor what changes our staff might make on your website (if any):
https://wordpress.org/plugins/wp-security-audit-log/
We really look forward to helping you.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.