Update broke favicon

Website has been up for 4 years no issues and moved 3 times to other hosting services. After most recent update the favicon has reverted to what the template creator had put in as a place holder. The icon is 512×512

Things I have tried :

I renamed it to favicon.png

Set the icon again in wordpress and cleared the cache.

Deleted the original and uploaded again

Still shows the template favicon instead of the one I had replaced.

How can I fix this ?

Any tips appreciated

 

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