You're very close to understanding to quantum eraser experiment / the even more upsetting delayed-choice quantum eraser. Even though it sounds as though your a

You're very close to understanding to quantum eraser experiment / the even more upsetting delayed-choice quantum eraser. Even though it sounds as though your arguments are gotchas that prove quantum mechanics to be nonsense, it turns out the world really is that way. https://en.wikipedia.org/wiki/Delayed-choice_quantum_eraser https://en.wikipedia.org/wiki/Delayed-choice_quantum_eraser