We'll create fresh WordPress site with Move Site Icon To Settings installed. You have 20 minutes to test the plugin after that site we'll be deleted.
This plugin adds the site icon option to Settings -> General.
If you disable or do not use the customizer, then you will have trouble updating the site icon. The site icon is used for favicons, and the new oEmbed feature. This plugin makes the site icon editable from the general settings page.
The plugin is a modified version of Jetpack\’s site-icon module.
Note: The plugin does not remove the ability to change the site icon from the customizer. It only adds another way to change the site icon.