I don't know Xcode very well, and had been using it sporadically to test a project exported from Unity.
I recently added a StoreKit Configuration to the project, and since then it gives me ≈10s after launching before the beach ball appears, and it never leaves. Xcode says it is "Indexing" but I don't know if that's an obvious culprit.
I can still build my project via the fastlane tool, on the command line, and the newly-added StoreKit configuration works just fine.
But I cannot use Xcode interactively any more, unless I re-export the project from Unity. The only difference between it working and hanging is the Store Kit configuration.
How do I understand what's going on, and (ideally) fix it? The Activity Monitor gives a bunch of backtraces that don't have an obvious network or I/O culprit in them.