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Google re-added the itemReviewed.datePublished property. This is a recommended property that was apparently removed accidentally as part of the previous update to the Fact Check structured data documentation (September 9th 2022).
Previously, Google stated on their Fact Check documentation that a single page could host multiple ClaimReview elements, each for a separate claim. This has completely changed, however, and the documentation now states that each page can only be eligible for a single Fact Check rich result, and that the page must only have one ClaimReview element.
Updated the eligibility guidelines required to enable the Fact Check Rich Result, which now includes all relevant guidelines in one place (previously some of them were only mentioned in the Publisher Center article about fact-checked content).
Some new guidelines were also added:
Google added a disclaimer to the Fact Check documentation to clarify that they are 'exploring ways to surface multiple fact checks. You may not see a rich result that features multiple fact checks in Google Search right away.'