This is bug where the UI does not update. This happens when you try to change to a different work (recording of) in the relationship editor, and choose one of the options in the droplist (or copy/paste a work url). This only happens the first time you change the work (i.e the correct work is displayed if you change from Work A, to Work B, to Work C) or if you change back to Work A and start over again.

How to:
1. Go to e.g. https://musicbrainz.org/release/23ce24c1-604b-4d72-a189-6a61f8f4ccef/edit-relationships and edit any of the "live recording" relationships.
2. Use the magnifying glass or manually write the work name (or copy/paste the new work url).
3. Choose any of the works in the droplist.
4. Click "done" -> nothing happens. Click "done" again -> the window closes and the colour changes to yellow, but the work name and the information displayed under the work name does not change.
5. Enter the edits -> everything works as intended.