My username is 69444, and my display name is cowboy.
In the Android version of the app (haven’t seen in iOS versions yet) the new sidebar incorrectly states that your display name is your username and your username is your display name.
However, in the Switch Accounts UI it is shown correctly.
This is not really much of an issue but will most likely confuse some players so I am reporting it anyways.
Expected behavior
I expect that in the new sidebar, your display name and username will be shown correctly, like how the Switch Accounts UI does it.