But we can “prove” that isn’t true because what if you aren’t disassembled on the first side? Just copied over. Either you have a sense and control of both bodies at once, or in a real teleport where you are disassembled, you’re gone the moment you teleport and the “you” that remains is another different person with exactly your thoughts, feelings, motivations, memories, etc.
When making long noodles. Make a circle with your thumb and index. Bring your index all the way to the base of your thumb. Somewhere in there is the amount you will eat (of dry noodles that fit). Find it, and never make the wrong amount again.