Android has a problem after setting paddingTop in a nested RelativeLayout

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:paddingTop="17dp"
    android:background="#00ffff"
    >
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:textColor="?attr/text_color_black_academia"
        android:textSize="17sp"
        android:text="@string/test" />
</RelativeLayout>

The result of this layout display:

Then, wrap a LinearLayout in the outer layer of the RelativeLayout, namely:

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="#00ff00"
    android:orientation="vertical">
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:paddingTop="17dp"
        android:background="#00ffff"
        >
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:textColor="?attr/text_color_black_academia"
            android:textSize="17sp"
            android:text="@string/test" />
    </RelativeLayout>
</LinearLayout>

The result displayed at this time is:

 This is the problem, but I still don't quite understand how it is. It is worth noting that the android:layout_centerVertical="true" attribute of TextView is the core of the problem, because if this attribute is removed, it can be displayed normally.