Hide bottomnavigation when navigating fragment

Hi I am unable to hide the bottomnavigation bar when selecting pushing a second fragment onto a particular tab as Fragment B does not have access to Navigation menu activity. I have tried using
bottomnavigation.setBehaviorTranslationEnabled in Fragment B but the Fragment is unable to stop bottomnavigation from being seen as null

Please help me on whether its possible to hide the navigation bar when showing internal fragments such as chat logs and comments fragments

thanks
henry

Start by reproducing navigation from a selected tab to an internal fragment such as chat logs or comments, then inspect how Fragment B accesses the navigation menu activity and why bottomnavigation is null. Done means the bottom navigation reliably hides when the internal fragment is shown and remains available when returning to the tab.

Written by the indexing model from the issue text.