[Android] things disapear after showing a interstitial ad

After closing an interstitial ad some of the buttons and elements in the app disapear.

Loading the ad and events work correctly:
this.ad.onAdEvent((event, error, data) => { switch (event) { case AdEventType.LOADED: console.log('ad loaded'); this.ad.show(); break; case AdEventType.CLOSED: this.routerExtensions.navigate(['postcard-viewer', Constants.Modules.PostCardEditor.result]); break; case AdEventType.OPENED: break; case AdEventType.IMPRESSION: break; case AdEventType.FAILED_TO_SHOW_FULL_SCREEN_CONTENT: console.error('InterstitialAd failed to load:', error); this.routerExtensions.navigate(['postcard-viewer', Constants.Modules.PostCardEditor.result]); break; } }); this.ad.load();

Showing the ad also works correctly.

Once the ad is closed, some buttons and elements are not shown anymore for example:

<Button *ngIf="stateService.freeCard && !loadingQuota && quotaAvailable" [isEnabled]="!showspinner" class="pcc-dark-button send-button" [text]="'viewer.backside.free-send' | translate" actionKey="SEND" (tap)="onSendClick()"> </Button>

从 issue 中显示的插屏广告事件处理程序和 CLOSED 导航路径开始，然后在 Android 上关闭广告以复现问题。比较导航前后的视图状态；广告关闭后按钮和其他元素仍保持可见即表示完成。