Not getting correct index

Which OS ?

Both iOS and Android

Version

Which versions are you using:

• react-native-swiper v?
  1.6.0
• react-native v0.?.?
  0.63.3

Expected behaviour

Neither onMomentumScrollEnd nor onIndexChanged would give the correct index. Resulting in unpredictable behavior

Actual behaviour

Random results and unusable indexes. After swiping 4-6 times I will usually be delivered the value -1.
Created the following function to get the correct index:

calculateIndex(nativeEvent) {
        if (!nativeEvent) {
            return 0
        }
        if (!nativeEvent.layoutMeasurement) {
            return 0
        }
        if (!nativeEvent.contentOffset) {
            return 0
        }
        const screenWidth = nativeEvent.layoutMeasurement.width
        const xOffset = nativeEvent.contentOffset.x
        const index = xOffset / screenWidth

        return index
    }

How to reproduce it>

<Swiper
                        horizontal={true}
                        width={c.WIN_WIDTH}
                        height={c.WIN_HEIGHT}
                        index={this.state.currentIndex}
                        scrollEnabled={true}
                        loadMinimal={false}
                        showsPagination={false}
                        pagingEnabled
                        automaticallyAdjustContentInsets
                        onMomentumScrollEnd={this.onMomentumScrollEnd}
                        bounces={true}
                        loop={false}
                        autoplay={false}
                        showsButtons={false}
                        removeClippedSubviews={false}>
                        <View style={styles.slide1}>
                            <Text style={styles.text}>Hello Swiper</Text>
                       </View>
                     <View style={styles.slide2}>
                          <Text style={styles.text}>Beautiful</Text>
                    </View>
                   <View style={styles.slide3}>
                         <Text style={styles.text}>And simple</Text>
                  </View>
  </Swiper>

Steps to reproduce

Start with the Swiper callbacks onMomentumScrollEnd and onIndexChanged, using the supplied three-slide reproduction and the reported React Native 0.63.3 and react-native-swiper 1.6.0 versions. Reproduce the incorrect and -1 indexes on both iOS and Android, then verify that the callbacks consistently report the active slide index.