No, I have not experienced that.
I always pair first through the Settings screen and they try to go to the app. Except for that first time when it said “Go Pair first”. I’ve actually never gone into Demo mode.
Something else to consider, Apple made some “feature” where when you turn bluetooth or wifi off through the Control Center, it doesn’t actually do it. So when I want to be sure, it turn it off through the Settings app. Here is a link to that article: