这是一个不寻常的设置-Yoast通常识别正确的永久链接。您可能需要考虑更改设置自定义帖子类型的方式，以便它具有所需的名称和URL。您可能有两个指向相同内容的不同URL，这对于SEO是不可取的，有时会让最终用户感到困惑。

但是，要回答最初的问题，可以使用另一个名为wpseo_breadcrumb_links:

// Hook to the filter
add_filter(\'wpseo_breadcrumb_links\', \'wpse_332125_breadcrumbs\');
// $links are the current breadcrumbs
function wpse_332125_breadcrumbs($links) {
    // Use is_singular($post_type) to identify a single CPT
    // This assumes your CPT is called "project" - change it as needed
    if(is_singular(\'project\')) {
        // The first item in $links ($links[0]) is Home, so skip it
        // The second item in $links is Projects - we want to change that
        $links[1] = array(\'text\' => \'Case Studies\', \'url\' => \'/case-studies/\', \'allow_html\' => 1);
    }
    // Even if we didn\'t change anything, always return the breadcrumbs
    return $links;
}