I had this issue with my project. I resolved it by removing completely my existing Launch Screen from the project and completely recreating it from scratch - using File > New > File > Launch Screen. Do not just copy one from another project as a workaround either. Thankfully my Launch Screen is simple to recreate. I've found in the past that new versions of iOS are extremely sensitive to Launch Screens from older projects. My Light Content status bar style now works consistently, and sometimes my app would not properly reinstantiate under iOS 15 when bringing the app back from the background - these issues have both now been resolved. Of course also ensure that you choose the new Launch Screen from the dropdown under [Target] / General / Launch Screen File.

Why can't I delete my comment :(

This is my personal nightmare. I haven't done an app release for a couple of months simply because I cannot get tab bar appearances working correctly, and my apps rely on tabbars. I would love to use the default iOS 15 behaviour, except when switching between tabs the appearances are not reset - switching to tabs that don't contain a scrollview from tabs that do contain a scrollview sometimes there will be a non transparent tab bar and other times it will be correctly transparent. It flickers if you hover around the scroll edge on a scrollview. Just a nightmare. I can't even get consistent iOS 14 looking translucent all the time tabbars otherwise I would just revert. Things would be easier if I just targeted iOS 15, but funnily enough not all users use iOS 15 so I would go broke if I did that. I'm sure the excuse will be that I haven't coded my VC's in a fashion that are consistent with standards wrt tabbars and scrollviews and tabs without scrollviews but I just can't find what the standard should be - instead all I find is an internet full of hacky ugly fixes to revert behaviour :( #frustration