It has been noted by the Google Search Console team that data anomalies int he Accelerated Mobile Pages (AMP) report in Search Console occurred between January 23 and February 3.

Google wrote:

Some users may see elevated levels of errors of the type “Major content mismatch” due to a processing error on our side. Correct error counts should return to their actual levels within few days.

Any “Major content mismatch” errors that you see in those reports between the given date ranges, you can check back again later in the week for corrected data.

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