Hi, after rereading this closed issue I think this is not a problem but the expected behaviour. The back button is displayed if the the user goes from Tab A->Parent view to Tab A->Child view (same tab). If the user goes from Tab A to Tab B->Child view, the back button must not display.
The reported problem in that issue (the user goes from Tab A to Tab B->Child view and can’t navigate up to Tab B->Parent view) is working fine at least in the latest version.