Yoast REST-API in yoast_head missing field thumbnailUrl, image

[mgdev2022]

• [ x] I've read and understood the contribution guidelines.
• [ x] I've searched for any related issues and avoided creating a duplicate issue.

In the rest-api => wp-json/wp/v2/posts/

in the JSON Attribute yoast_head the fields image and thumbnailsUrl are missing.

How can we reproduce this behavior?

1. open a url like /wp-json/wp/v2/posts/
2. search for thumbnailsUrl in the field yoast_head field in the value

Technical info

• If relevant, which editor is affected (or editors):

• Classic Editor
• Gutenberg
• Classic Editor plugin

• Which browser is affected (or browsers):

• Chrome
• Firefox
• Safari
• Other

Used versions

• WordPress version: 6.0.2

• Yoast SEO version: 19.8

• Relevant plugins in case of a bug:

• Tested with theme: Newspaper HD, Twenty Twenty-Two

[mgdev2022]

	/**
	 * Gets the main image ID.
	 *
	 * @return int|null The main image ID.
	 */
	public function generate_main_image_id() {
		switch ( true ) {
			case \is_singular():
				return $this->get_singular_post_image( $this->id );
			case \is_author():
			case \is_tax():
			case \is_tag():
			case \is_category():
			case \is_search():
			case \is_date():
			case \is_post_type_archive():
				if ( ! empty( $GLOBALS['wp_query']->posts ) ) {
					return $this->get_singular_post_image( $GLOBALS['wp_query']->posts[0]->ID );
				}
				return null;
			default:
				return null;
		}

Maybe the error is in this function, because of return null in default?

[mmikhan]

I wonder why you want to show thumbnailUrl and image under the yoast_head in the Rest API? Those data aren't Yoast SEO but are part of the default WordPress Rest properties.

[webw4tcher]

In version 19.2 the fields were there. In the current version, these fields are gone. If you adjust the code below, the fields reappear but are then duplicated. So it seems a bug. Please restore the state of version 19.2. Thanks for the bug fix.

[mgdev2022]

I wonder why you want to show thumbnailUrl and image under the yoast_head in the Rest API? Those data aren't Yoast SEO but are part of the default WordPress Rest properties.

The problem did not occur in older versions and appears to be in the meta-tags-context.php file.

[mmikhan]

Thanks for clarifying and clearing up the confusion. I investigated it further, and it turned out the thumbnailUrl you're referring to is part of the schema markup. The thumbnailUrl indeed appears in the Rest API under the yoast_head in Yoast SEO v19.3 or earlier but not since v19.4. Interestingly, the thumbnailUrl does appear in the schema markup outputting in the page source code in the latest release.

So, it seems to be a bug, but I have reached out for a confirmation internally before giving you a confirmation here. I'll get back to you on this once I have more information about it. In the meantime, I will mark the issue as a bug!

[mmikhan]

Thanks for your continued patience. It turned out to be a bug that most likely occurred here #18599. We moved the issue to our internal issue management repository (IM-2045) to have a fix ready for it!