Over the past couple of days we’ve been experiencing some instability in reference matching, meaning that a small percentage have not yet been processed. We are working on a fix, and it’s related to the ongoing REST API instability. All missing matches will eventually be redone, although this may take some months to complete.
If you see isolated cases of missing reference matches and you can identify the DOI of the cited object, you can deposit it via the usual methods. Please get in touch with our support team if you see a large number of missing matches across one or more metadata deposits.