Since it’s working for other projects, there’s got to be either a setting or a caching issue.
Settings wise you can verify they are the same with the fresh projects, so I’ll focus on the caches.
First back your project up somewhere. Source control is best, but a copy will do if you don’t have any source control setup.
After backing up your project, delete these folders while the project is closed, and they’ll regenerate when you launch the project. This will rebuild a ton of cached data so it may take a bit.
- Saved
- Intermediate
- DerivedDataCache
Then try again.