Could not use Android Back Button when in walkthrough?

Hi! First of all, many thanks for developing such a convenient and powerful walkthrough tool for RN. I have finished developing the walkthrough for our app right now and I am considering utilizing the back button on Android to act as the "Previous" button. However, when in walkthrough, pressing the back button on android does not trigger the function. And after the walkthrough has been finished by tapping the "Finish" or "Skip" button, the handler can be successfully called. I am not usre how to handle it or is it intended? My codes for this functionality is as followed.

import { BackHandler } from 'react-native'
componentWillUnmount () {
    BackHandler.removeEventListener('androidBackButtonPress', this.handleBackPress)
  }

  handleBackPress = () => {
    console.log('test')
    return true
  }
  componentDidMount () {
    BackHandler.addEventListener('androidBackButtonPress', this.handleBackPress)
  }

Start with the BackHandler listener shown in the issue and the walkthrough's active-state handling; reproduce the behavior while a walkthrough is running. Done means Android back presses invoke the intended previous-step behavior during the walkthrough without breaking Finish or Skip.