This is an annoying Safari bug that only crept up on me since iOS 17. If I have a whole bunch of tabs loading pages in the background and I then bring up a blank tab and start to enter a URL into its address field, at some point Safari will eject me out of that and clear all I had so far entered. Perhaps when it has fully loaded one of the backgrounded pages? Admittedly, one of them is a nasty garbage page full of ads and video, but still, what the heck, Apple? I can’t get it reproduce 100% of the time, making it hard to file a good bug report. It happens a whole lot more to me on cellular vs. wifi so I’m assuming it has to do with interrupted page loads or spotty network. But not sure yet.