Android Studio 3.2 Canary构建未呈现导航标签

Android Studio 3.2 Canary 14未呈现导航标签。它仅显示等待构建完成的时间。

navigation_graph

<?xml version="1.0" encoding="utf-8"?>
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <fragment
        android:id="@+id/fragment_nav_host"
        android:name="androidx.navigation.fragment.NavHostFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:defaultNavHost="true"
        app:navGraph="@navigation/navigation_graph" />
</navigation>