A set of recordings needed splitting to distinguish between the original mixes and recent remasters. I tried to do this by using the release editor on the remaster release, and selecting "Add new recording" on the recordings tab for each track. This created edits the edit medium edits, #15061290 and #15061291. These edits don't show links to the new recordings (and it appears that no recordings were actually created). When the edit was approved, it failed with a status of "Failed dependency"
I've been unable to reproduce this behaviour entirely on the test server. An edit medium edit that creates recordings still doesn't link to the new recordings, but does now succeed when approved, and the medium does get updated appropriately.
I suspect that that may be because this bug has been partially fixed there (though I've been unable to find a ticket describing this), and all that remains is to fix the edit medium edits to link to the new recordings correctly, as per the bug summary. However, it may just be that something odd happened with the above two edits. If this is the case, then this needs investigating specifically, and an additional ticket may need creating.