there's a huge thread about this already. been an issue since iOS 14.0. I personally saw it on my iPhone X on day 1, and it has persisted on my iPhone 12 Pro as well.
Not badly but at times. It’s almost like iOS14 is asking itself does the person really want to swipe up ? its meant to be iOS not skynet. hopefully they fix it because it seems I’m lucky enough with this issue but it’s worse for others.