Description

When on a multisite network and in the Gutenberg paragraph block editor the link suggestion feature is not working. It works fine on single site.

Console error:

In case the image is too hard to read on the consol error "GET http://sage-life-site-network.lndo.site/wp-json/wp/v2/search?search=55&per_page=20&type=term&_locale=user" "400 Bad Request"a

Step-by-step reproduction instructions

1. On a site within a multisite network create and publish a page (Page A)
2. Create a second page and on that page (using the Gutenberg paragraph block) add text to that page.
3. Select some of the text and click the Link button.
4. Begin to type the title of the page created in Step 1

Notice that the suggestion functionality does not work. This is the issue.

Screenshots, screen recording, code snippet

Environment info

WordPress Version: 5.7
All Browsers
MacOS 11.1

Pre-checks

• I have searched the existing issues.
• I have tested with all plugins deactivated except Gutenberg.