Have you heard of, know or performed an experiment with a Stern-Gerlach Interferometer (SGI) that would prove that it is really behaving like it wasn't there. We obtained exactly the same spin orientation at output as it was at input, no matter the apparatus orientation. From what I can find there is big trouble in performing Stern-Gerlach inteferometer itself, not even talking a bout a sequential experiment with it.
This case bothers me the most. I'm very skeptical about spooky theories and want to know what is experimental base on that.
If possible a link to a trusted source would be super nice.