Nobody that has claimed to have found two seperate identical fingerprints has been able to back that up either. I’m pretty sure most myths are associated with the unlikeliest scenario and not the opposite like you are doing. By their very nature they are usually outlandish, religiously outlandish or old wives tales that turned out to be false.
You’re basically saying “it’s a myth that spiders don’t crawl into our mouths as we sleep”. It kind of makes the opposite sound like a regular occurrence and saying “we haven’t watched every person sleep throughout history to know if it’s 100% always the case” is not a valid reason to say it