I have updated Android Studio to 3.3.2, and found gradle sync warning.
WARNING: The option setting 'android.databinding.enableV2=false' is experimental and unsupported. The current default is 'true'.
WARNING: The option setting 'android.enableExperimentalFeatureDatabinding=true' is experimental and unsupported. The current default is 'false'.
In gradle.properties you can set
android.useNewApkCreator=true, This will fix first warning.