Google has confirmed a data logging bug in the Search Console Generative AI achievement study in Search between the dates of November 9 and November 11, 2026 which caused a decrease in impressions.
Google posted the matter on the data anomalies pages and wrote, "A logging error caused a decrease in impressions on the Generative AI achievement study in Search for data from November 9 - November 11, 2026. This matter affects data logging only."
If you log in to Search Console and go to the Generative AI achievement study in Search you volition see an note concerning this error:
I should note, the November 2026 center update started on November 10, 2026, correct during this data logging bug.
So if you noticed a weird decrease in impressions from November 9 to November 11, 2026, you are not alone. This is fair a reporting bug and had no effect on your achievement in Google Search.
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