Only one image in sitemap in every post and page

@constantflux Some plugins, themes and page builder modules may not show additional images in the sitemap, if your products have additional images you want included you may need to add them via a filter: wpseo_sitemap_urlimages.

We have additional information on including images in the site located at the following link: https://yoast.com/help/images-in-the-xml-sitemap/

Also, unfortunately, per the forum guidelines, we cannot answer questions about our premium products. For questions about these products, please contact our support team directly.

So people seem to have had an issue with RankMath and WP Bakery as well and they solved it together with RankMath:
https://notasusual.co/rank-math-wpbakery-sitemap-fix/

Specifically with this code:

add_filter( 'rank_math/sitemap/urlimages', function( $images, $id ){
    if ( empty( $images ) ) {
        $post = get_post( $id );
        if ( $post && strpos( $post->post_content, '[vc_row' ) !== false ) {
            preg_match_all( '/(?:image|images|ids|include)\=\"([^\"]+)\"/', $post->post_content, $matches );
            foreach ( $matches[1] as $m ) {
                $ids = explode( ',', $m );
                foreach ( $ids as $id ) {
                    if ( (int) $id ) {
                        $images[] = array(
                            'src' => wp_get_attachment_url( $id ),
                            'title' => get_the_title( $id ),
                        );
                    }
                }
            }
        }
    }

    return $images;
}, 10, 2 );

If you look at this, can you see if this is a fix that would work with yoast as well and if so, how could I set this up?
Is the what you mean by “add them via a filter”? The solution for the problem with WP Bakery and RankMath was solved by attaching the code at the end of the functions.php. No need to manually include images from each post/page/potfolio item that doesn’t work.

@constantflux

We understand you found a possible workaround to fix the issue in reference to RankMath. While we need to investigate further this issue, since you’re a Yoast SEO Premium user, we would request that you contact support[at]yoast.com helpdesk directly. We could then troubleshoot the issue and resolve it.

We are going ahead and marking this issue as resolved due to inactivity. If you require any further assistance please create a new issue.