当我从后台堆栈恢复片段（包含折叠工具栏）时，折叠工具栏会卡在中间位置。它最初完全崩溃，但是当我将片段放回到堆栈中时，移动到下一个片段然后返回到这个片段然后它被卡在中途
XML
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 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:orientation="vertical">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
android:minHeight="0dp"
app:elevation="0dp">
<android.support.design.widget.CollapsingToolbarLayout
android:id="@+id/collapsing_toolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:contentScrim="?attr/colorPrimary"
app:expandedTitleMarginEnd="64dp"
app:expandedTitleMarginStart="48dp"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:minHeight="200dp"
android:transitionName="frame_layout"
app:layout_collapseMode="parallax"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<TextView
android:id="@+id/tiffin_service_initials_text_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="40dp"
android:background="@color/colorPrimary"
android:fontFamily="sans-serif-light"
android:gravity="center"
android:text="AB"
android:textColor="@color/md_white_1000"
android:textSize="40sp"
android:transitionName="text_view" />
</FrameLayout>
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_collapseMode="pin"
app:layout_scrollFlags="scroll|enterAlways"
app:titleTextColor="@color/md_white_1000" />
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
<LinearLayout
android:id="@+id/linear_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
app:cardCornerRadius="0dp"
app:cardElevation="2dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="horizontal">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_weight="1"
android:clickable="true"
android:foreground="?selectableItemBackground"
android:gravity="center"
android:orientation="horizontal"
android:padding="16dp">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/ic_star" />
<TextView
android:id="@+id/rating_text_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="8dp"
android:text="4.7"
android:textSize="20sp" />
</LinearLayout>
<View
android:layout_width="0.2dp"
android:layout_height="match_parent"
android:alpha="0.5"
android:background="@android:color/darker_gray" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_weight="1"
android:clickable="true"
android:foreground="?selectableItemBackground"
android:gravity="center"
android:orientation="horizontal"
android:padding="16dp">
<ImageView
android:layout_width="28dp"
android:layout_height="28dp"
android:scaleType="centerCrop"
android:src="@drawable/ic_call"
android:tint="@color/colorAccent" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="8dp"
android:text="@string/call"
android:textSize="20sp" />
</LinearLayout>
<View
android:layout_width="0.2dp"
android:layout_height="match_parent"
android:alpha="0.5"
android:background="@android:color/darker_gray" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_weight="1"
android:clickable="true"
android:foreground="?selectableItemBackground"
android:gravity="center"
android:orientation="horizontal"
android:padding="16dp">
<ImageView
android:layout_width="24dp"
android:layout_height="24dp"
android:scaleType="centerCrop"
android:src="@drawable/ic_chat"
android:tint="@color/md_blue_500" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="8dp"
android:text="Chat"
android:textSize="20sp" />
</LinearLayout>
</LinearLayout>
</android.support.v7.widget.CardView>
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginTop="8dp"
app:cardCornerRadius="0dp"
app:cardElevation="2dp">
<LinearLayout
android:id="@+id/menu_linear_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:orientation="vertical"
android:padding="16dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:alpha="0.5"
android:text="@string/menu"
android:textSize="20sp" />
<ProgressBar
android:id="@+id/progress_bar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginTop="16dp" />
<android.support.v7.widget.RecyclerView
android:id="@+id/menu_recycler_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:visibility="gone">
</android.support.v7.widget.RecyclerView>
</LinearLayout>
</android.support.v7.widget.CardView>
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginTop="8dp"
app:cardCornerRadius="0dp"
app:cardElevation="2dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="16dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="16dp"
android:alpha="0.5"
android:text="@string/address"
android:textSize="20sp" />
<com.google.android.gms.maps.MapView
android:id="@+id/map_view"
android:layout_width="match_parent"
android:layout_height="200dp">
</com.google.android.gms.maps.MapView>
<TextView
android:id="@+id/address_text_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="16dp"
android:textSize="12sp" />
</LinearLayout>
</android.support.v7.widget.CardView>
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
</android.support.design.widget.CoordinatorLayout>