.show class leaked on navlink

Created by: ntd

Bootstrap 4.2.1: on every dynamic tabbed interface, whenever I click on a .tablink the classes .active .show are properly added to the new item but the .show class is not removed from the previously active item. If this is an issue, it seems to be a regression because with bootstrap 4.1.3 all is working as expected.

Here is a MWE using pills; just inspect Home or Profile while switching between the two panes: https://jsfiddle.net/4oy92hmx/