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Yeah you are not alone, I have seen this across a few properties too. It feels like Google is running separate caching pipelines for AI Overviews vs the main SERP and they are wildly out of sync. The SERP favicon cache seems absurdly sticky right now, even when everything is correct technically. Clearing cache signals like sitemap updates or recrawls rarely move it. In most cases it eventually flips with no clear trigger, which is frustrating but consistent. At this point I treat favicon changes as very low priority unless it is broken entirely.
