I’m not sure it’s broken as such. The unread and new tabs are deliberately hidden when there’s nothing to see. 
Though I think it is possible to force them to reveal themselves even when empty if that’s what you had in mind?
Maybe something like this?
// for desktop
.navigation-container .nav-pills .nav-item_new {
display: initial !important;
}
.navigation-container .nav-pills .nav-item_unread {
display: initial !important;
}
// for mobile
.dropdown-menu .nav-item_new {
display: initial !important;
}
.dropdown-menu .nav-item_unread {
display: initial !important;
}