Ionic 4 bugs on Android 7 emulator

Ionic Framework
1

Ionic 4 has some bugs on Android 7 emulator.
For example --ion-grid-columns and ion-img not working.

Ion grid columns example bug

Just install blank app and add:

<ion-grid>
    <ion-row class="ion-justify-content-start">
      <ion-col size="12">
        <div>
          1 of 2
        </div>
      </ion-col>
      <ion-col size="4">
        <div>
          2 of 2
        </div>
      </ion-col>
    </ion-row>
  </ion-grid>

In css:

ion-grid {
    --ion-grid-columns: 16;
}

Result:

68d23e
68d23e.png365×621 15.8 KB

I’ve read this post and understand that emulator has legacy browser. But i can’t be sure that users with real devices have latest Chrome browser with latest webview. Is it possible fix this bugs on “old webview” (using polyfills or somehow else)?

Emulator User-Agent

Mozilla/5.0 (Linux; Android 7.0; Android SDK built for x86 Build/NYC; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/51.0.2704.90 Mobile Safari/537.36

Ionic info 
Ionic:

   ionic (Ionic CLI)             : 4.12.0 (/usr/local/lib/node_modules/ionic)
   Ionic Framework               : @ionic/angular 4.5.0
   @angular-devkit/build-angular : 0.13.9
   @angular-devkit/schematics    : 7.3.9
   @angular/cli                  : 7.3.9
   @ionic/angular-toolkit        : 1.5.1

Cordova:

   cordova (Cordova CLI) : 9.0.0 (cordova-lib@9.0.1)
   Cordova Platforms     : android 8.0.0
   Cordova Plugins       : cordova-plugin-ionic-keyboard 2.1.3, cordova-plugin-ionic-webview 4.1.1, (and 4 other plugins)

System:

   Android SDK Tools : 26.1.1 (/Users/user155266/Library/Android/sdk)
   ios-deploy        : 1.9.4
   ios-sim           : 8.0.1
   NodeJS            : v10.15.3 (/usr/local/bin/node)
   npm               : 6.9.0
   OS                : macOS Mojave
   Xcode             : Xcode 10.2.1 Build version 10E1001