I tried clearing cache, history, all the Safari things I could find. I tried adding more "apple-touch-icon" resolutions. Every "is your favicon good?" site I could find said it was fine. It works just fine on my iPad (and every other non Apple device I have). It works on my SO's iPhone running the same version of iOS, and same screen size. The iPhone shows the favicon when I go to tab-switch mode. It shows the correct image if I create a link on my Home Screen. It will not show the favicon on my favorites page.

And yeah, given how quickly the bug was closed that I opened, I'm guessing Apple decided I'm full of it too.

At some point, it's not worth it any more.

I keep the link around on my iPhone for when I get bored and try to debug it from time to time, but really I'm mostly curious if iOS will ever decide to do the right thing.