Android nestedscrollview not triggering nested fling - android-recyclerview

Question

I'm using nestedscrollview in sliding card to pull it up and down, by extending coordinator layout behavior class and overriding its nested scrolling and flinging methods.
In my layout, I have on recylerview, and two nestedscroll view one to wrap the header and make it pull the card up and down, and one for the to wrap and error message which appears after any error message.
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/slidinguppanel_slidingcontainer"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clickable="true"
android:background="#android:color/white">
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_marginTop="?actionBarSize"
android:fillViewport="true"
android:fitsSystemWindows="true"
android:layout_gravity="fill_vertical"
android:layout_height="match_parent">
<include
android:id="#+id/blocking_error_panel"
layout="#layout/blocking_error_panel" />
</android.support.v4.widget.NestedScrollView>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<android.support.v4.widget.NestedScrollView
android:id="#+id/nested_scroll_view"
android:layout_width="match_parent"
android:fillViewport="true"
android:layout_gravity="fill_vertical"
android:fitsSystemWindows="true"
android:layout_height="wrap_content">
<LinearLayout
android:id="#+id/choose_bus_headers"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:clickable="false"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:clickable="false"
android:layout_height="?actionBarSize"
app:popupTheme="#style/AppTheme.PopupOverlay">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:orientation="horizontal">
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#color/colorPrimary"
android:src="#drawable/ic_publicbus_choosebus_bus" />
<com.wrzit.app.Utils.CustomTextView
android:id="#+id/txtPanelHeader"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="#dimen/toolbar_text_margin_start"
android:text="#string/bus_panel_header_text"
android:textAlignment="center"
android:textColor="#android:color/white"
android:textSize="#dimen/card_header_text_size"
app:typeface="roboto_regular.ttf" />
</LinearLayout>
<ImageButton
android:id="#+id/btnSlider"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="end"
android:layout_marginRight="#dimen/activity_horizontal_margin"
android:background="#color/colorPrimary"
android:padding="5dp"
android:src="#drawable/ic_expand_more_white_24dp" />
</android.support.v7.widget.Toolbar>
</android.support.design.widget.AppBarLayout>
<com.wrzit.app.Utils.CustomTextView
android:id="#+id/txtGPSNotification"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/notification_background"
android:padding="#dimen/notification_padding"
android:textAlignment="center"
android:textColor="#android:color/white"
android:textSize="#dimen/regular_text_size"
android:visibility="gone"
app:typeface="roboto_regular.ttf" />
<com.wrzit.app.Utils.CustomTextView
android:id="#+id/txtNetworkNotification"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/notification_background"
android:padding="#dimen/notification_padding"
android:textAlignment="center"
android:textColor="#android:color/white"
android:textSize="#dimen/regular_text_size"
android:visibility="gone"
app:typeface="roboto_regular.ttf" />
<ProgressBar
android:id="#+id/progress"
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:layout_marginTop="-7dp"
android:indeterminate="true"
android:visibility="visible" />
<LinearLayout
android:id="#+id/layoutFilterBusStop"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="16dp"
android:orientation="horizontal"
android:visibility="gone">
<LinearLayout
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:id="#+id/txtFilterBusStopName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Jalan Raja Chulan"
android:textColor="#android:color/black"
android:singleLine="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="12sp"
android:text="Filtered Bus Stop" />
</LinearLayout>
<LinearLayout
android:layout_width="0dp"
android:layout_weight="0.1"
android:layout_height="match_parent">
<ImageView
android:id="#+id/btnFilterBusStopClose"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:gravity="center|right"
android:src="#drawable/ic_close_black_24dp" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
</android.support.v4.widget.NestedScrollView
>
<android.support.v7.widget.RecyclerView
android:id="#+id/listChooseBus"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:divider="#E7E8E7"
android:dividerHeight="1dp" />
</LinearLayout>
The behavior detects triggers onNestedPreFling() when I fling the recyclerview, or the nestedscrollview that wraps the header. The problem occurs when I fling the nestedscrollview that wraps the error layout, it triggers onNestedPreScroll(), but doesn't always triggers onNestedPreFling(), even though scroll amount larger than the touch slop.
I tried to identify what cause this issue, but unfortunately was not able to identify it. hopefully someone knows what prevents onNestedPreFling() from being called.