Don’t make the stupidest mistake because of which plugins may not show up, I spent hours of my life to understand this, and when I realized it I almost broke my forehead with facepalm.
The Scripts folder should start with a small letter.
I mean /home/$USER/.config/ardour8/scripts.
Can you try rewriting this, as I don’t really understand what you are saying? Where does the typo exist looking for a large letter vs a small letter for instance? It shouldn’t affect plugins as plugins don’t really go in that folder (Except maybe Lua Plugins, not sure on those).