SwiftUI fileExporter works on iPad but not on iPhone

With the latest iOS 14.2 and Xcode 12.2 beta, I'm trying to save a file with:

.fileExporter(isPresented: ....)

all works well on iPad, but not on iPhone simulator. The file "chooser" does not appear, and so nothing is saved. According to the doc, availability iOS 14+.

Is this correct behaviour?