Test the site code

 

Site theme currently: 6.4.2

 

Facebook and Instagram logo shows in 6.1.2         eg. fab fa-facebook     

 

New 'brand' code for Facebook and Instagram logo for 6.4.0   eg. fa-brands fa-facebook

 

Both codes work in Site Theme Config:  6.1.2 and 6.4.0 
but not when I change the Site theme config to 6.4.2