HarmonyOS 沉浸式获取导航栏高度一直是0

const avoidAreaType = window.AvoidAreaType.TYPE_SYSTEM; // 系统默认区域，包括状态栏，导航栏  
const avoidArea = mainWindow.getWindowAvoidArea(avoidAreaType);  
LogUtils.error(`navBarHeight = ${avoidArea.bottomRect.height}`)  
AppStorage.setOrCreate<number>("statusHeight", avoidArea.topRect.height);  
AppStorage.setOrCreate<number>("navBarHeight", avoidArea.bottomRect.height);
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