Hm. Well, the Steinberg Library is King here, right? If it’s not in the Library it’s not going to show up in GA5 - and - if you can see the same GA icons in GA then they are there.
As to the thought that the download of GA5 missed a set or two? I have to assume here that Steinberg is doing their job and delivering their product in it’s entirety. You would have to seek their help with this. All the best Andy.