HarmonyOS 升级API12后，使用ObjectLink遇到编译警告

升级IDE和API 12后，使用如下代码，编译器提示警告：

Assigning the attribute ' moduleComponentLinkObserver as VideoPlayerCoverImageModuleComponentLinkObserver' to the '@ObjectLink' decorated attribute 'moduleComponentLinkObserver' is not allowed. <ArkTSCheck> 
1.

代码如下：

@Builder
export function buildVideoPlayerCoverImageModuleComponent(moduleComponentLinkObserver: PlayerModuleComponentLinkObserver | null) {
  VideoPlayerCoverImageModuleComponent({
    moduleComponentLinkObserver: moduleComponentLinkObserver as VideoPlayerCoverImageModuleComponentLinkObserver
  })
}

@Observed
export class VideoPlayerCoverImageModuleComponentLinkObserver extends PlayerModuleComponentLinkObserver {
  imageUrl: string | null = null
  hidden: boolean = false
}

@Component
export struct VideoPlayerCoverImageModuleComponent {
  @ObjectLink moduleComponentLinkObserver: VideoPlayerCoverImageModuleComponentLinkObserver
  build() {
    Stack() {
      if (!this.moduleComponentLinkObserver.hidden) {
      }
    }
    .width('100%')
    .height('100%')
    .hitTestBehavior(HitTestMode.Transparent)
  }
}
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