Is this account situation in the app Store a Bug or a Feature?

In the past, the NetEase email address [email protected] was used for the national account. Later, in order to facilitate the distinction between the US region and the national region, the national account was changed to [email protected]. Now log in to the app store with your country account, click on the icon in the upper right corner of the store, the email address displayed in the account is the previous [email protected], continue to click in, and it is displayed as [email protected]. After the app store changes the U.S. account, when the app downloaded by the Chinese account is updated, it will be prompted to enter the password of [email protected] instead of [email protected]. Of course, the password can be updated normally. In fact, [email protected] is no longer used. I deliberately registered another apple account with [email protected] again. Relatively speaking, [email protected] and [email protected] The two accounts already exist independently, but the above situation still exists. Although it doesn't affect usage, it looks awkward, and I don't know if it's a bug or a feature.