Is this behavior by design or is it a bug?
I don’t know but IMO it doesn’t really matter: if it’s causing you problems, you should file a bug about it.
Please post your bug number, just for the record.
Share and Enjoy
Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware
let myEmail = "eskimo" + "1" + "@apple.com"
Thanks. I have filed a bug, ID 28275988.