I wish I'd never tried round walls. I used them to design a Sulani ocean houseboat and the rear of the boat was a rounded deck, the front pointed. I placed a room on top of the deck and added rounded walls back and front. I had to set them to medium height because it kept saying things were intersecting with the roof when there was no roof.
Eventually I decided to place a roof section at the back for a curved wall instead of a rounded wall. I deleted the rounded wall but it left a shadow as if it was still there. I still got error messages saying I had a rounded room but I didn't. I'd never added a rounded room. When the walls are on cutaway, there is still a round shadow where the old round wall used to be. You can't fully delete them when placed on a deck it seems.
I wish I'd never touched them. It took me 2 to 3 hours to delete one wall and reshape my boat. They are unforgivably buggy and temperamental. It's constant error messages, even after deletion.
I've attached 2 images to show the shadows left in build mode and a completed image so you can see it has no round rooms but it says it does. I was really disappointed because this was going to be a gallery submission and those round "ghost walls" it's left with, well they just cause such problems when making any changes to it. It ended up being such a buggy build I don't feel that I can upload it to the gallery for anyone else to wrestle with it.
Live mode is luckily unaffected.
Edit: Just to add I'm on Xbox Series S.