I just installed iOS13 public beta 3 onto my iPad Mini 5. Safari is broken now - just a blank white screen for about 15 seconds, then the app crashes. I've tried a reset of the iPad, and it still doesn't work. My Chrome browser works just fine. One thing different I noticed is that the installed software is now listed as "ipad OS 13.0" - betas 1 and 2 were listed as "iOS 13.0" I haven't had much time to play with everything else, but that's the only problem I've run into so far.