ion-refresher is not work on ionic v4

[favrio]

Bug Report

Ionic Info
Run ionic info from a terminal/cmd prompt and paste the output below.

Ionic:

   ionic (Ionic CLI)          : 4.0.0-rc.11 (/usr/local/lib/node_modules/ionic)
   Ionic Framework            : @ionic/angular 4.0.0-alpha.11
   @angular-devkit/core       : 0.7.0-rc.2
   @angular-devkit/schematics : 0.7.0-rc.2
   @angular/cli               : 6.0.8
   @ionic/ng-toolkit          : 1.0.0-rc.11
   @ionic/schematics-angular  : 1.0.0-rc.11

Cordova:

   cordova (Cordova CLI) : 6.5.0
   Cordova Platforms     : none

System:

   ios-deploy : 1.9.2
   ios-sim    : 7.0.0
   NodeJS     : v8.9.4 (/usr/local/bin/node)
   npm        : 5.6.0
   OS         : macOS High Sierra
   Xcode      : Xcode 9.4.1 Build version 9F2000

Environment:

   ANDROID_HOME : not set

Describe the Bug
Hi guys, i install the lastest v4 rc11 version, and insert a ion-refresher inside the ion-content component. But it's not work as expected.

There is a warning on console logs.
ion-refresher didn't attached, make sure if parent is a ion-content

Steps to Reproduce

1. Create a new rc11 version project.
2. Put a refresher inside the ion-content at any page.
3. Refresher is not work, and the console give a warning message.

Related Code

<ion-content>
  <ion-refresher slot="fixed">
    <ion-refresher-content></ion-refresher-content>
  </ion-refresher>
</ion-content>

[ionitron-bot]

Thanks for the issue! This issue is being locked to prevent comments that are not relevant to the original issue. If this is still an issue with the latest version of Ionic, please create a new issue and ensure the template is fully filled out.