ng2-pdfjs-viewer doesn't work in Ion-Modal ng-template

[connectMyClub]

ng2-pdfjs-viewer doesn't work in Ion-Modal ng-template appears as a grey empty frame. I've tested outside of a modal and the pdf loads as expected.

<ion-modal [isOpen]="isPdfModalOpen" (willDismiss)="onWillDismiss($event)">
    <ng-template>
      <ion-header >
        <ion-toolbar>
          <ion-buttons slot="start">
            <ion-button (click)="cancel()">Close</ion-button>
          </ion-buttons>
        </ion-toolbar>
      </ion-header>
      <ion-content class="ion-padding ion-text-center">
        <ng2-pdfjs-viewer
            [pdfSrc]="pdfSrc"
            zoom="auto"
            pagemode="thumbs"
          >
      </ng2-pdfjs-viewer>
      </ion-content>
    </ng-template>
  </ion-modal>