When WorldCat Discovery calls the knowledge base to see if there is a link to surface, it uses the article publication date to determine if it falls within the coverage range. If only a year is provided, the system populates the month and day as 01-01. This can result in a link displaying even if the full text is not yet available.
This is a known issue with ahead-of-print articles. If a provider database only indexes full text content for this journal once it has been assigned to an issue, with a 12-month delay. OCLC cannot prevent the knowledge base link from appearing on the record because the article's publication date falls within the full text coverage range (e.g., 1974-09-01 to 12 months ago).
At this time, OCLC errs on the side of providing full-text access as soon as possible and uses 01-01 for the month and day when only the year is in the record. This sometimes leads to knowledge base links surfacing on a record before the full text is truly available.
Example: Discovery view of an embargoed article that could cause this issue:
To troubleshoot: