A handful of error exits on the screen recordings delete/rename request - an expired session, a recording that could not be found or was not yours, and the non-JavaScript fallback delete path - returned an error to the page without ever writing to the application log. That made it impossible to tell what actually went wrong when someone reported a failed delete.
All of these paths now log a warning (or error, for an outright delete failure) with the recording, user, and action involved, alongside the cases that already logged.