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we have the favicon set in Yootheme > Settings > Favicon and Customizer > Site Identity (for a long time now) but Google still shows the WP icon. I read that it's in a 3rd place (not favicon in theme customize, not the one in settings). Not sure where to find it. They said "it had a random rectangle picture selected not compatible for favicon which is why it defaulted to WP logo."
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For a favicon to be compatible with Google, it needs to be a square, and an increment of 16 px i believe (32×32, 64×64, 128×128)