Hi – could it be that there is a bug that prevents Mantra from displaying a site’s favicon after upgrading to WordPress 5.4? All looks OK in the configuration but mine disappeared.
Should have completed: using the generic option in WordPress (Design/Customizer/Site identity) does restore the favicon. So something is somehow broken between Mantra and this option.
We recommend using WordPress’ option for defining the favicon. Mantra’s own option dates back from long before WordPress supported this and we have not tested it in a while.