Duplicating an email that's used in a login

Hi all,

I just found that in V11 I seem to be able to enter an email on an account, create a login tied to that email, and then add that exact same email to a different account in the client.  In V10, it would throw an error telling you that you cannot enter that email, because it is being used as a login on another account.

Has anyone else encountered this?  Is this an intentional change, or a bug?  Wanted to check it out here before "bugging" (haha) my IT department with it.

Thanks!

Beth