Strange behavior with CoordinatorLayout, AppbarLayout and SwipeRefreshView

Question

Strange behavior with CoordinatorLayout, AppbarLayout and SwipeRefreshView

I'm trying to use the new Android support design library, but I'm running into weird behavior (maybe not that weird) with CoordinatorLayout having AppBarLayout and SwipeRefreshView children: actually when I sit up SwipeRefreshView AppbarLayout hides the toolbar, even the first one them is empty.

<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/drawer_layout"
android:fitsSystemWindows="true"
>

<android.support.design.widget.CoordinatorLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <android.support.v7.widget.Toolbar
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/toolbar"
            android:minHeight="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
            app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
            app:layout_scrollFlags="scroll|enterAlways"/>
    </android.support.design.widget.AppBarLayout>

    <android.support.v4.widget.SwipeRefreshLayout
        android:id="@+id/swipe_refresh"
        android:layout_height="match_parent"
        android:layout_width="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        >
        <android.support.v7.widget.RecyclerView
            android:id="@+id/recycler_view"
            android:layout_height="match_parent"
            android:layout_width="match_parent"
            android:scrollbars="vertical"
            >
        </android.support.v7.widget.RecyclerView>
    </android.support.v4.widget.SwipeRefreshLayout>


    <android.support.design.widget.FloatingActionButton
        android:id="@+id/fab"
        android:src="@drawable/ic_add"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:fabSize="normal"
        android:layout_gravity="end|bottom"
        android:layout_margin="16dp"
        android:tint="@android:color/white"
        />

</android.support.design.widget.CoordinatorLayout>

<android.support.design.widget.NavigationView
    android:id="@+id/navigation_drawer"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:layout_gravity="start"

    app:headerLayout="@layout/drawer_header"
    app:menu="@menu/menu_drawer">
</android.support.design.widget.NavigationView>