get_uploaded_header_images() returns the incorrect image URL

[Kopepasah]

When using a CDN (e.g. ​S3 ) and a plugin that modifies the File URL for an attachment (e.g. ​Amazon S3 and CloudFront), the get_uploaded_header_images() function returns an array with the unmodified URL instead of the new URL.

In the case of this particular plugin, we have the option of removing the media from the media folder and using the media strictly on the CDN; however, the result is a blank image (by looking in the empty media library) instead of the image on the CDN.

The attached patch uses wp_get_attachment_url( $header->ID ) in lieu of $header->guid to return the correct URL.

Introduced in [17757].

I can't really think of anything that can go wrong with 27222.patch​ and it kinda makes sense.

A workaround could be changing the guid during attachment insert, especially if the original file is not saved locally, in which case you'll end up with a guid pointing to a file that does not exist, regardless of what wp_get_attachment_url() or get_uploaded_header_images() return.

In 27434:

Use wp_get_attachment_url() instead of the GUID when getting header image URLs. Fixes #27222. Props Kopepasah.

#22986 was marked as a duplicate.