Thank you for the screenshots. I am not quite sure what is going on in them, but I have also noticed the two from the third image "from" and "}". I have found these to be a bit strange, but I am not sure what causes them. When I first noticed them, I do not think I had any megastructure mods enabled.
Unfortunately, I have no idea how to fix this, as I have no idea what all 2.2 actually changed. The author of the base mod seems to be working on it, but is very cofused as well. I will see if I can help him out, and possibly learn a bit about 2.2 while I'm at it.

Okay, from what i understand, they changed a lot of the fundemental mechanics. i noticed that ringworlds have no mineral, energies, or betherian ore deposits and are tehre are only districts for cities, energy plants, and agriculture. only the building slots that you unluck from the pops have any mining capabilities.
Each ringworld also has 50 districts

When i tired to build one of those structures, it just ended up building a structure inside the sun that when selected did not bring up any place where you could contruct the rings with

I have gotten into Ringworld modding itself, and managed to put together a little mod, similar to the base mod for this fix, but made on 2.2 mechanics.
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=1591024851
Fully Habitable Ringworlds is an extra megastructure (does not replace any other) that looks like a normal Ringworld, except instead of have 4 habitable sections, 4 seam sections, and 4 "tech" sections, it has all 12 as habitable.
It is built on 2.2, meaning I am able to change the amount of supported districts!
I already have an addon to provide a 100-district version.
Feel free to go check it out, and enjoy!

Thank you!