The problem is that the migration does not work.
I migrated a blueprint together with its dependencies to another project. Most things were migrated successfully, but none of the cpp files (or basically anything from the “source” folder). Since some of the dependencies of my blueprint are cpp files, it does not work. So the migration failed, and I have to do it manually.
The problem with doing it manually is that I don’t immediately know which cpp files are dependencies I need, and which ones are unrelated.