[IONIC 4][Android] Keyboard overlaps input in form

Ionic Framework
1

In every form of my Android application, the keyboard overlaps the whole screen without making it scroll.
If I try to scroll the entire view manually, nothing changes.
Even adding 300px of fake height to ion-conten, through a div with a fixed height the scroll is locked.
I tried to change AndroidManifest adding the property , but nothing. Also I tried to pass config object to IonicModule.forRoot with the property scrollAssist setted true.

I dont’t understand why I have this bug only in Android app. In iOS everything works fine.
I noticed that the ion-content has --keyboard-offset setted to 0px by :host style.
The code of my view is below:

<ion-content color="primary" padding>

    <ion-row>
        <ion-col>
            <ion-icon (click)="back()" size="large" class="top-custom-navigation" name="arrow-back"></ion-icon>
        </ion-col>
    </ion-row>


    <ion-row>
        <ion-col size="12" padding-horizontal>

            <h1>{{'REGISTRATION.WHAT_EMAIL' | translate}}</h1>
            <form #form="ngForm" padding-vertical>

                <ion-label class="small bold uppercase">{{'COMMON.EMAIL' | translate}}</ion-label>
                <ion-input [(ngModel)]="mailExist" #mail="ngModel" name="mailExist" email required
                           mailExist></ion-input>
                <div *ngIf="mail.getError('mail') && (mail.dirty || mail.touched)">
                    <ion-label class="error-txt">Mail già presente</ion-label>
                </div>
                <br/>
                <ion-label class="small bold uppercase">{{'COMMON.USERNAME' | translate}}</ion-label>
                <ion-input [(ngModel)]="username" #userName="ngModel" usernameExist name="username"
                           required></ion-input>
                <div *ngIf="userName.getError('username') && (userName.dirty || userName.touched)">
                    <ion-label class="error-txt">Username già presente</ion-label>
                </div>

                <ion-row>
                    <ion-col size="9">
                        <p class="small" [innerHTML]="'REGISTRATION.NEWSLETTER_FLAG' | translate"></p>
                    </ion-col>
                    <ion-col size="3" padding-vertical>
                        <app-switch (change)="onChangeNewsletterFlag($event)" style="margin-top:10px;"></app-switch>
                    </ion-col>
                </ion-row>


            </form>

        </ion-col>
    </ion-row>


    <app-fab-button class="fixed-bottom-right"
                    type="white"
                    [active]="form.valid"
                    (onClick)="next()"></app-fab-button>

</ion-content>
2

are you solved this issue?