Icons Missing From Font Awesome Icon Collection Import

I'm trying to upload the Font Awesome 6 Solid free icons to an Icon Collection but only about a third of the icons are actually being imported, it seems. I have imported the ttf file and then the metadata, but less than 500 of the 1390 icons are found.   Does anyone know why this is happening? I have seen a store module that has everything correctly, making it unclear what is causing my imports to fail.
1 answers

Yes, some of them are composed icons, a combination of multiple icons, or in some cases there for backward compatibility there are duplicates.

However there is some trouble rending some of the icons of the solid in the Structure Mode, while they render in the Design Mode and on the Web