My feedback about UI:
I used to have to go into my UI scale settings every start because even if the screen settings were good, the icons at the bottom were cut off, so I had to move the slider from 100% and then back to 100% to be scaled.
Now, the icons when starting the game seem to be a bit too high, and the copy building icon appears lower, until I do the above trick again.
Plus, as other mentioned, the build menu seems blown up after selecting the copy building option.
About mods: it seems to be affecting modded buildings in the sense that they appear in the research menu, but they don't appear in the build menu. As I'm writing this, one that has already been updated and fixed is the Airlock Door. The good news is that at least those modded buildings already placed in the world are still there and function normally, so no game braking of current builds, and that is a good thing.