Web Browser in VR Shows No Content

Hi there, I am developing a VR app in which I want to open up some web pages. I tried to use the web browser plugin and it turns out to work normally in the Editor. But when I run my app on Oculus Quest 2 the widget shows no content but black screen. The get title function works well though. Does anyone have some suggestions? Any help would be appreciated.

Plus, the engine version is 4.27.2, and the problem only occurs when I put the widget into a widget component inside an actor. The webpage will be shown when I add the widget to viewport, but in VR app the viewport is not well presented so I really want a 3d widget solution.