If you deploy the app to the iOS device using the Mac editor's Launch button or Project Launcher, the second and subsequent launches will fail.
The following message is output when startup fails. The process when launching from the editor has not been completed successfully. Perhaps, I think the same reason is that the Running ... dialog in the lower right does not disappear after launching from the editor.
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-72845 in the post.