I faced the same issue, but was able to solve it by adding more keys to the info.plist file (Xcode 12 and iOS14).
As stated in this thread (https://stackoverflow.com/questions/56896719/how-to-hide-the-status-bar-in-swiftui) you just have to paste
<key>UIStatusBarHidden</key>
<true/>
<key>UIViewControllerBasedStatusBarAppearance</key>
<false/>
in your info.plist file.
Afterwards
.edgesIgnoringSafeArea(.all)
.statusBar(hidden: true)
worked just fine for me.
gabolichtenstein
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution