HarmonyOS 鸿蒙Next web页面电话有标准的phone标识，点击却无法跳转拨号盘

参考这个demo:

import web_webview from '@ohos.web.webview';
import { BusinessError } from '@kit.BasicServicesKit';
import { call, observer } from '@kit.TelephonyKit';

@Entry
@Component
struct WebComponent {
  controller: web_webview.WebviewController = new web_webview.WebviewController();

  testMethod() {
    // 调用查询能力接口
    let isSupport = call.hasVoiceCapability();
    if (isSupport) {
      // 如果设备支持呼叫能力，则继续跳转到拨号界面，并显示拨号的号码
      call.makeCall("021-50504728", (err: BusinessError) => {
        if (!err) {
          console.log("make call success.");
        } else {
          console.log("make call fail, err is:" + JSON.stringify(err));
        }
      });

      // 订阅通话业务状态变化（可选）
      class SlotId {
        slotId: number = 0
      }

      class CallStateCallback {
        state: call.CallState = call.CallState.CALL_STATE_UNKNOWN;
        number: string = "";
      }

      let slotId: SlotId = { slotId: 0 }
      observer.on("callStateChange", slotId, (data: CallStateCallback) => {
        console.log("call state change, data is:" + JSON.stringify(data));
      });
    }
  }

  build() {
    Column() {
      Web({ src: '', controller: this.controller })
        .onLoadIntercept((event) => {
          if (event) {
            if (event.data.getRequestUrl().startsWith('tel')) {
              this.testMethod()
              return true
            }
          }
          return false;
        })
    }
  }
}