Angular Material Tabs SelectedIndex 0 not working

My tab was selected but the styling did not update. I had to set:

.mat-tab-label-active {
  opacity: 1;
}

I also had to set: encapsulation: ViewEncapsulation.None // inside @Component

it's a bug but you can use 2 ways data binding, it works

<md-tab-group [(selectedIndex)]="value">