I have no idea if Windows has quarantined specific source files from VS. I just reinstalled it a few days ago and didn’t receive any notifications that anything was quarantined…
I was hoping your build would solve this issue but it seems this is an issue that comes from waaaaaaaay back and for all the things you fixed you didn’t fix this one thing 
Reason why I say that is because a friend of mine tried to build a plugin today also using the standard UE4.26 he installed via the Launcher as well as via the custom source he received to build UE4 for the PS5. In both versions he experienced the same issue as me.
that means UE4.26, 4.27, UE5EA, UE5 your version and UE4 for PS5 on my machine and my friend’s machine halfway across the world. Seems like you are the only person I know of who can actually get any version of UE to build a plugin
Anyway, thanks for the help. If I can’t do this the RIGHT way (making a package) then I guess I’ll just do it the EASY way and just copy paste those 4 files into my projects each time… or just migrate them. That should take 10 seconds and NOT fail for 4 weeks using 3 versions of VS across 5 versions of UE over two continents… Plus it will free up 145Gb of space 
Again, thanks for trying to help