I forgot to mention that code completion was working.
I fiddled around some more: I created a new project, imported all the files (all but the @main App file) and the error appeared, again. On the ContentView file from the template!
I tried to import the files one by one, but I got crazy with all the dependecy errors I get, some seem to be importable without invalidating said macro.
And no, I did not redefine the macro in any file, or anything :/
So I'm hoping someone else runs into the same problem with easier code and will try to work without previews on this project. Or use the old content_providers.
alexander129
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...everything compiles just fine and I can run the app on my phone