Rank Math says I’m not using the focus keyword (while I actually am)

Hi,

I’ve just installed the plugin because i’ve got nice feedbacks about it. Indeed, the plugin works fine, except for one particular thing.
For posts, I am setting my focus keyword, and I get extremely bad scores, despite those posts were already SEO optimized.
After checking this out, I’ve noticed that Rank Math were saying that I’m not using the focus keyword on critical spots (title, first 10% of body, slug etc.), while the focus keyword actually is present at those places.
After studying the problem a bit further, I’ve noticed that the plugin were unhappy if I were to use the focus keyword with the individual words in a different order than specified, or with additionnal words between them.

For short, if the focus keyword were not an exact “copy-paste” in my post, the plugin considers it is absent.
For instance, if I’m using the focus keyword “brew homemade beer” and the title says “Guide to brew your own homemade beer”, Rank Math won’t be happy about it. But if the title instead says “Guide to brew homemade beer”, the plugin will light up green.

Since I’m mostly using SEO plugins for post specific SEO, this is quite crippling to me.
What could I do to fix this ?

Also, it might be important to solve the issue: I’m writing in French, and using French Keywords, so maybe that matters too.

Thanks in advance for your support !
Regards,

Mathieu.