Android FragmentManager and Fragment Result API

How can be that a fragment F which uses the new Fragment Result API to get results from 2 other fragments: A, B gets the result from A but not from B because B has a different parent FragmentManager (and I don't know why) ? How could be something like that ? 2 fragments called in the same way but they end up having same Activity but different FragmentManager ? The function calls are the following:

//THIS DOESN'T WORK. THE LISTENER IS NOT CALLED AFTER THE RESULT IS SET

private fun navigateToItemLocation() {

        setFragmentResultListener(REQUEST_LOCATION_KEY) { s: String, bundle: Bundle ->

            val locationId = bundle.getParcelable<ParcelUuid>(LOCATION_ID)!!.uuid
            viewModel.viewModelScope.launch(Dispatchers.IO) {
                val location = LocationRepository().get(locationId)!!
                changeItemLocation(location)
            }
        }


        val action = ItemRegistrationPagerHolderDirections.actionNavItemRegistrationPagerToNavStockLocationSelection()
        findNavController().navigate(action)
    }

//THIS WORKS FINE:

private fun navigateToItemDetails(item: Item2) {

        setFragmentResultListener(SELECTED_ITEM_KEY) { s: String, bundle: Bundle ->

            val propertySetId = bundle.getParcelable<ParcelUuid>(SELECTED_ITEM_SET_ID)!!.uuid
            clearFragmentResultListener(SELECTED_ITEM_KEY)

            viewModel.viewModelScope.launch(Dispatchers.IO) {
                val repository = PropertySetRepository()
                val propertySet = repository.get(propertySetId)!!
                val propertySetInfo = ItemFactory.loadPropertySetInfo(propertySet)

                withContext(Dispatchers.Main) { setPackageCode(null) }
                selectItem(item.item, propertySetInfo, item.description, null)
            }
        }

        val action = ItemRegistrationPagerHolderDirections.actionNavItemRegistrationToNavStockItemDetails(ParcelUuid(item.item.id), true)
        findNavController().navigate(action)
    }

Both fragments A and B are in a separate Dynamic Feature. The only single problem I have is that when the following function is called:

fun onSelect() {

        viewModel.pickedLocation.value = (viewModel.selectedLocation as? LocationExt2?)?.location
        val result = bundleOf(Pair(LOCATION_ID, ParcelUuid(viewModel.pickedLocation.value!!.id)))
        setFragmentResult(REQUEST_LOCATION_KEY, result)
        findNavController().popBackStack()
    }

setFragmentResult(REQUEST_LOCATION_KEY, result)

Doesn't produce any result because the FragmentManager is not the same of the calling Fragment. The same method in fragment A which is:

private fun onSetSelected(id: UUID) {

    propertySets.removeObservers(viewLifecycleOwner)
    adapter.tracker = null
    setFragmentResult(SELECTED_ITEM_KEY, bundleOf(Pair(SELECTED_ITEM_SET_ID, ParcelUuid(id))))
    findNavController().popBackStack()
}

As a temporarily workaround I replaced the call to Fragment's FragmentManager with Activity.supportFragmentManager.setFragmentResultListener. It works but still I do not understand why fragments A and B behave differently...