"og:image" not working on multisite, when using the Network Media Library plugin

Please give us a description of what happened

The Network Media Library plugin allows users on a multisite network to share a single media library, instead of having to manage a separate media library for each site on the network.

However, the Yoast SEO plugin is not able to detect images across sub-sites. This causes issues like the "og:image" tag not working properly.

To Reproduce

Step-by-step reproduction instructions

1. We created a test multisite installation with 3 sites with Yoast SEO.
2. We installed the Network Media Library plugin. By default, this plugin uses the media library from site ID number 2 for all other sites.
3. We went to side ID number 2 and uploaded an image through its media library.
4. We then went to one of the other sites (in our case, site ID 3) and created a new post. In the Social tab of the Yoast metabox we selected the image we uploaded in step number 3.

Expected results

1. I expected the image to be shown in the og:image tag.

Actual results

1. The image is not recognized and the tag is not added to the post.

Screenshots, screen recording, code snippet

If possible, please provide a screenshot, a screen recording or a code snippet which demonstrates the bug.

Used versions

• WordPress version: 6.1.1
• WordPress Theme: TwentyTwenty One
• Yoast SEO version: 20.3
• Relevant plugins in case of a bug: Network Media Library version 1.5.0

Reproduce the issue with WordPress multisite, Yoast SEO, and the Network Media Library plugin, using an image uploaded on site ID 2 and selected from site ID 3's Social tab. Trace how the selected image is recognized across sites and verify that the post emits the expected og:image tag.