SEO permalink problem

Hi,
I’ve switched from Yoast to Rankmath and now see that it seems impossible to get the correct permalinks for SEO. We have two sections of the site with a project custom type. These are divided into two categories, manually rewritten with Permalink Manager as either example.com/features/post_name or example.com/faq/post_name. When opening older posts edited with Yoast, the SEO URLs looks correctly displayed and saved in the RankMath SEO Preview, but when opening snippets Rankmath is way off, displaying something altogether wrong. This means we currently can not add ANY new posts which mean that our business is suffering.

When trying to change to the correct SEO URL – THAT SHOULD MATCH THE PAGE URL EXACTLY – it doesn’t work. It does not want to understand / and adds “project” by itself, so we are ending up with faulty URLs like example.com/projects/features-post_name that should match the post URL exactly, i.e. example.com/features/post_name. I’m not a SEO guru, but I do understand that two URLs to the same page is not only confusing but also bad for SEO, thus making RankMath useless.

We do not have the time to spare to redo half the site for an SEO plugin, however good, to avoid the automatic “project” part of the URL and split up the custom post type in two custom post types simply to facilitate the automatic naming. Do I need to go back to Yoast (which I really do not want to do)? Is there any shortcode that can get it to match display the page URL added through Permalink Manager? Please advise! I really really like RankMath and do not want to switch back to Yoast.