When using air 29/30/32, it will automatically switch to dx11.
When using use air 23/25/26, the result is correct.
[Starling] Context ready. Display Driver: DirectX9 (Standard Extended)

when use air 29/30/32, The result is like losing some color. The texture is completely transparent when the camera screen is black. How to solve this error?
[Starling] Context ready. Display Driver: DirectX11 (Enhanced)
air29/30/32

package {
import flash.display.MovieClip;
import flash.display.Sprite;
import flash.events.Event;
import flash.geom.Rectangle;
import starling.core.Starling;
public class Main extends MovieClip {
    public function Main() {
        addEventListener(Event.ADDED_TO_STAGE, onAddToStage);
    }
    private var _starling:Starling;
    private var sm:MainStarling;
    private function onCreateComplete(e:Object):void {
        sm = _starling.root as MainStarling;
        sm.init();
    }
    private function onAddToStage(e:Event):void {
        removeEventListener(Event.ADDED_TO_STAGE, onAddToStage);
        stage.color = 0xffffff;
        stage.frameRate = 60;
        Starling.multitouchEnabled = true;
        var viewPort:Rectangle = new Rectangle(0, 0, 400,300);
        _starling = new Starling(MainStarling, stage, viewPort);
        _starling.stage.stageWidth = 400;
        _starling.stage.stageHeight = 300;
        _starling.addEventListener("rootCreated", onCreateComplete);
        _starling.start();
    }
}
}

package {
import flash.media.Camera;
import starling.display.Quad;
import starling.display.Sprite;
import starling.textures.Texture;
import starling.display.Image;
public class MainStarling extends Sprite {
    public function MainStarling() {
    }
    public function init():void {
        var q1:Quad=new Quad(50,300,0xff0000);
        addChild(q1);
        var q2:Quad=new Quad(50,300,0x00ff00);
        addChild(q2);
        q2.x=100;
        Test();
    }
    private function Test():void {
        var camera:Camera = Camera.getCamera();
//        camera.setQuality(0, 100);
//        camera.setMode(1920, 1080, 30);
        var camTex:Texture = Texture.fromCamera(camera, 1, function ():void {
            var img:Image=new Image(camTex);
            addChild(img);
        });
    }
}

}

<?xml version="1.0" encoding="utf-8" standalone="no" ?>
<application xmlns="http://ns.adobe.com/air/application/30.0">
  <id>test</id>
  <versionNumber>1.0</versionNumber>
  <filename>test</filename>
  <description/>
  <name>test</name>
  <copyright/>
  <initialWindow>
    <content>test.swf</content>
    <systemChrome>standard</systemChrome>
    <transparent>false</transparent>
    <visible>true</visible>
    <fullScreen>false</fullScreen>
    <aspectRatio>portrait</aspectRatio>
    <renderMode>direct</renderMode>
  </initialWindow>
  <icon/>
  <customUpdateUI>false</customUpdateUI>
  <allowBrowserInvocation>false</allowBrowserInvocation>
  <supportedProfiles>desktop extendedDesktop </supportedProfiles></application>