https://kennay-kermani.medium.com/android-how-you-can-easily-determine-if-your-fragment-was-recreated-b0426edd6ebf - onViewCreated() recreation

TestFragment.kt

class TestFragment : Fragment(R.layout.fragment_test) {

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)

        if (savedInstanceState == null) {
            childFragmentManager.commit { replace(R.id.fragmentContainerView, SubTestFragment(), SubTestFragment::class.java.canonicalName) }
        }
    }
}