Don't save the current tab selected

I am using the 2.2.0 version of this library and it works all pretty well except one thing. If I click on a button inside a fragment tab and open a new activity, when I return by the back-button in the toolbar the first tab is always selected in the previous activity. How can I restore the selected tab before leaving the activity?

No source file or test is named. Reproduce the issue with a fragment tab, an opened activity, and toolbar back navigation, then trace how the selected tab is stored and restored; done means returning to the previous activity selects the tab that was active before leaving.

Written by the indexing model from the issue text.