Description

On page reload, the RTC feature re-adds the currently logged-in user in the collaboration session, resulting in duplicate user entries.

Step-by-step reproduction instructions

1. Enable RTC
2. Edit the same post or page
3. Refresh the page

Screenshots, screen recording, code snippet

Environment info

Wordpress 6.9.1
Gutenberg Development setup with all experimental options checked
php 8.2.27

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

Please confirm which theme type you used for testing.

• Block
• Classic
• Hybrid (e.g. classic with theme.json)
• Not sure