Browse mode/ navigation sidebar page details shows incorrect slug and link with non-latin characters

[carolinan]

Description

If a page has a slug that contains non-latin characters, the slug and page link is incorrect under Appearance > Editor > Pages > Chosen page.

The Slug /επίπεδο-2/ shows as %ce%b5%cf%80%ce%af%cf%80%ce%b5%ce%b4%ce%bf-2

Step-by-step reproduction instructions

1. Activate a block theme
2. Import the theme test data that has some content in greek, or create a new page with this Russian title: Привет, мир
3. Navigate to Appearance > Editor > Pages.
4. Select the page you created, or for example the page with the title "Επίπεδο 2 -Second Greek level"
5. See that the slug shows the wrong characters.
6. Optionally confirm that clicking the link below the page title in the sidebar still works. It only displays incorrectly.

Screenshots, screen recording, code snippet

Environment info

WordPress 6.2.2.
Gutenberg current trunk

Please confirm that you have searched existing issues in the repo.

Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

Yes