Rank Math SEO Analysis

I have been using this ACF add on for several years, great plugin.

Recently we installed Rank Math (we used to use Yoast). Rank Math is supposed to be able to read from ACF custom fields when performing SEO analysis, in fact it does work when using the stock Text Area or WYSIWYG editors, but when using the Code Field then Rank Math cannot read from the field to run it’s analysis on.

Any ideas as to why it may not work? At least with Yoast we can disable SEO analysis and just use it for meta data, but with Rank Math the option is only SEO on or off (per post type).

Cheers