Seems like the problem remains elusive, as always. Agreed I'm not seeing anything in that overall_header.html template which raises any suspicion. But from your end, do an actual "view page source" when viewing the home page of the phpBB site, and see what's actually being emitted into the HTML document.ChinaGal wrote: ↑Wed May 20, 2020 8:02 amIt is a good thought that perhaps there is maybe some other broken favicon.ico related code in the overall_header.html file, but we never added anything. So there shouldn't be. I also just did a search in the file for "favicon.ico" just in case and the only one that came up is the one that I just mentioned.
The only other code in the file at all related to "link rel=" is as follows...
Since aside from what's in the overall_header.html template itself, extensions have the opportunity to inject more, technically your hosting provider has enough control to be injecting more, etc. Still probably a long shot, but looking in the document generated when actually viewing your site is the more definitive / most definitive place to look.
Does your .htaccess perhaps block any specific bot "User-Agent" strings and/or any specific paths? (And perhaps the rule is affecting more than expected or intended.) Or maybe has a rule intended to prevent image leeching ("referrer is blank or not my own site") which might prevent the Google bot from downloading the image? Any robots.txt that tries to disallow crawling and/or specific bots? I think we can assume "no" -- since "the icon" has seemed like the only issue, and not "Google can't index my site" -- but just trying to think of any remaining reason.