Force BottomSheetFlatList open from first position every time useCallback called in react-native-bottom-sheet – React native

As Mohammad Momin said you can try scrollToIndex({index: 0, offset: 0}).

In order to do that you have to declare a ref for your FlatList and also specify the getItemLayout prop. Then you can call scrollToIndex.
So every time that you open the bottomSheet you have to call scrollToIndex.

The full working example I created is available in this github repositor which is something like this:

export const CustomBottomSheet = forwardRef(({
    zoneList = [],
    selectedZone,
    onZoneSelected
}, ref) => {

    const bottomSheetRef = useRef(null);
    const flatListRef = useRef(null);

    const scrollToItem = () => {
        if (!selectedZone) return;
        if (zoneList.length < 1) return;
        // find item index
        const index = zoneList.findIndex(value => value.id === selectedZone?.id);
        // scroll to destination index
        // it's better to set animated to true (experimental)
        flatListRef.current.scrollToIndex({
            animated: true,
            index: index, // 0
        })
        console.log('scrollToItem called by index:' + index)
    }

    const handleSnapPress = (index = 0) => {
        bottomSheetRef.current.snapToIndex(index);
        // call this method after each time user opens the bottom sheet
        scrollToItem();
    }

    const handleClosePress = () => {
        bottomSheetRef.current.snapToIndex(index);
    }

    const renderItem = ({ item }) => {
        return (
            <ListItem
                {...item}
                onPress={() => onZoneSelected(item)}
                isSelected={item.id === selectedZone?.id}
            />
        )
    }

    const getItemLayout = (_, index) => (
        {
            length: ListItem.HEIGHT,
            offset: (ListItem.HEIGHT + ListItem.VERTICAL_SPACING) * index,
            index: index,
        }
    )

    // forwarding methods via ref
    useImperativeHandle(ref, () => ({
        open: handleSnapPress,
        close: handleClosePress,
        snapToIndex: handleSnapPress,
    }));

    return (
        <BottomSheet
            ref={bottomSheetRef}
            index={-1}
            snapPoints={SNAP_POINTS}
            enableDismissOnClose={true}
            // onChange={handleOnChange}
            enablePanDownToClose={true}
            >
            <View style={{ backgroundColor: '#b2b2b2', alignItems: 'center', marginTop: 16 }}>
                <Text
                    style={{
                        color: 'white',
                        fontSize: 20,
                        textTransform: 'uppercase',
                        paddingStart: 10,
                    }}>
                    {'Select Zone'}
                </Text>
            </View>
            <BottomSheetFlatList
                // add ref and getItemLayout in order to use scrollToIndex method
                ref={flatListRef}
                getItemLayout={getItemLayout}
                data={zoneList}
                keyExtractor={(item) => item.id}
                renderItem={renderItem}
                contentContainerStyle={styles.contentContainer}
            />
        </BottomSheet>
    )
})