Good note! Thank you.
So, with that in mind, my first effort was to create an exception rule on Cloudflare for
/images/2/26/favicon.ico
allowing that file to be served without security. I flushed the cache while I was there, too. Then, opened an incognito window in my test browser (Which clears cache every time it's closed) and it didn't work. Went through my now typical routine and checked 3 browsers, it didn't work.
So I changed my $wgServer = to https because I hadn't been introduced to that setting yet. Went to Cloudflare, deleted the exception rule, cleared cache, and repeated verification routine. It still didn't work!
This issue is simply one of 3 websmithing white whales I'm dealing with right now. White. Whale. This issue just refuses to be solved!
Also, I can't get the font Trinigan FG to work on any sort of any kind of Wordpress, and I can't get phpBB to install on my IONOS webspace. These 3 problems are all I've done with my waking hours since i woke on Monday. 😩