Logic Pro X won't have instruments plugins or Vsts appear (but my effects plugins will appear)

To mention first, I have re installed my regular plugins and 3rd party plugins multiple times and have tried restarting my computer (Mac) and Logic many different times.

When I install an effect plugin (that isn't an instrument plugin) that'll show up in my mixer window for example, then I'll be able to see it and use it. Sometimes they won't appear right away, but I'll go to the plugin manager like many people suggest, I'll reset and rescan selection and then my effect plugins will appear. For example, I tried this with a free plugin called Veloco, and after I reset and rescanned my selection and it was all compatible etc, then it'd appear once I went to mixer and add effect where you'd see it listed with its Manufacturer at the very bottom.

I'm happy that my effects are all appearing (well I hope all of them are appearing and that there's not a bunch that are secretly missing), but it's not the same story with the instrument side of things.

Any plugin or Vst that I've gotten up to date, won't show up in any way whatsoever in the add instruments menu/library. The instruments though, will show up beside their manufacturer when I check inside the plugin Manager. Not only that, they pass all the validations when I select reset and rescan selection, and I'll be told they're compatible and ready to use. They'll just never show up though, no matter how many times I rescan them or restart my Mac or Logic. I don't see anywhere in my instrument library that says "Au instruments" or anything, they're no where to be seen.

This has been frustrating for me so far, because for a decent bit of time I've been entirely stuck on using Logic's default sound library, with a couple of my own effects plugins added in here or there. Mind you, Logic's default instruments aren't bad, but I've been able to get myself stuff that's a little better but I can't use it. I recently bought Native Instruments Komplete 12 Ultimate Collectors Edition which was a big one, but I can't find it, and it's a massive sound library that comes with it from what I saw. I also can't seem to use Omnisphere, some of my other 3rd party pluggins, a couple expansion packs that I downloaded off the native instruments website, or any of my old pro tools plugins. Fyi, the plugins that are coming from Pro tools pass the validation tests and Logic tells me that they're "success compat...."and in "use" , so they should be able to use inside Logic too which would be super awesome for me.

I know I rambled there, but that basically lays out the issue I've been having, the instruments don't appear anywhere and I've tried all the normal solutions people have been giving me so far.

Is there any solutions people know to get all these missing instruments to appear for me, and has anyone run into this issue with Logic before?

Thanks!