HarmonyOS 鸿蒙Next NavDestination如何进行跨models相互跳转

Learning与Discover可以向Learning跳转转，但是Learning无法向Learning与Discover跳转是为什么呢？ 

import { DiscoverView } from ‘@ohos/discover’;
import { LearningView } from ‘@ohos/learning’;
import { MineView } from ‘@ohos/mine’;

import { BusinessError } from ‘@kit.BasicServicesKit’;
@Entry
@Component
struct Index {
@State message: string = ‘Hello World’;
@Provide(‘appPathStack’) appPathStack: NavPathStack = new NavPathStack()
build() {
Column() {
Navigation(this.appPathStack) {
Tabs() {
      TabContent() {
        LearningView()
      }.tabBar(<span class="hljs-string"><span class="hljs-string">'LearningView'</span></span>)

      TabContent() {
        DiscoverView()
      }.tabBar(<span class="hljs-string"><span class="hljs-string">'DiscoverView'</span></span>)

      TabContent() {
        MineView()
      }.tabBar(<span class="hljs-string"><span class="hljs-string">'MineView'</span></span>)

    }
  }.mode(NavigationMode.Auto)

  <span class="hljs-comment"><span class="hljs-comment">// .toolbarConfiguration(this.TooBar)</span></span>
}
}
}
@Builder
export function IndexBuilder() {
Index()
}
<button style="position: absolute; padding: 4px 8px 0px; cursor: pointer; top: 8px; right: 8px; font-size: 14px;">复制</button>