IONIC 5 ion refresh not show spinner in app

Ionic Framework
1

Hi!
I have created a spinner with <ion-refresher>. When I am testing the app on the emulator, that is on the web, the spinner is displayed, but when I compile the app the spinner is not displayed.
The refresh function works! but the problem is that the spinner is not displayed.

image in web- testing and developing app.
Screenshot from 2022-11-14 11-10-46

image APP-> IOS Iphone 7s.

spinnerFade
spinnerFade1024×702 50.5 KB

when sliding your finger down on the screen starts the refresh, a space is generated where the spinner would go, but the spinner does not appear.

myComponent.html =>

<ion-content class="background">
  <!-- REFRESH -->
  <ion-refresher  slot="fixed"
    (ionRefresh)="doRefresh($event)"
    pull-factor="1.2"
    pull-min="60"
    pull-max="40"
    snapback-duration="200ms">
    <ion-refresher-content
    pullingIcon="lines"
    refreshingSpinner="dots"
    ></ion-refresher-content>
  </ion-refresher>
......
</ion-content>

myComponent.css=>

  ion-refresher ion-refresher-content {
    --color:#FFFFFF!important;
    background: url(../../../../../assets/img/base_roja.png)  no-repeat;
    background-size: 100%


  }
  ion-refresher.refresher-native {
    display: block;
    z-index: -1;
  }

*It was ready tested whit z-index = 1;


Ionic:

   Ionic CLI                     : 6.19.1 (/usr/lib/node_modules/@ionic/cli)
   Ionic Framework               : @ionic/angular 5.4.4
   @angular-devkit/build-angular : 0.1000.8
   @angular-devkit/schematics    : 10.0.8
   @angular/cli                  : 10.0.8
   @ionic/angular-toolkit        : 2.3.3

Cordova:

   Cordova CLI       : 11.0.0
   Cordova Platforms : browser 6.0.0, ios 6.2.0
   Cordova Plugins   : cordova-plugin-ionic-keyboard 2.2.0, cordova-plugin-ionic-webview 4.2.1, (and 11 other plugins)

Utility:

   cordova-res                          : 0.15.4
   native-run (update available: 1.7.1) : 1.4.1

System:

   Android SDK Tools : 26.1.1 (/home/guidogagliardini/NuevosDocs/Android/Sdk)
   NodeJS            : v14.19.1 (/home/guidogagliardini/.nvm/versions/node/v14.19.1/bin/node)
   npm               : 6.14.16
   OS                : Linux 5.15

Thanks.