I have tested this successfully on your release:
- Edit the release Log in - MusicBrainz
- Go to Tracklist tab and press Add Medium then Existing medium sub tab in the popup
- Type 23 as track count, the title and artist are already ok, press Search
- Select the same release, it is not the first match for unknown reason. Click it and press Add Medium to get a duplicate medium on your release track list editor now
- Remove first medium’s last tracks and second medium’s first tracks
And voilà! 
Submit your edit with a nice note.