Ionic Datetime Issue Android

I’ve had a report from a production app about the datetime component not working. Instead of showing numbers for the time it just shows a series of periods “…” (picture attached)

I can’t seem to replicate the issue on my own device or any emulator and haven’t found any resource online with the same issue. I’ve asked for specific device details but it looks like a Samsung Galaxy device from the photo, still awaiting Android version number. Any ideas?

      <ion-datetime displayFormat="HH:mm" [(ngModel)]="notificationTime" (ionChange)="setNotificationTime()"></ion-datetime>

  public notificationTime: any;

  constructor(private storage: Storage, private quoteService: QuoteService, private alertService: AlertService, private router: Router) { }

  ngOnInit() {'notificationTime').then((val) => {
      if(val === null) {
        this.notificationTime = "1990-01-01T07:00Z";
      } else {
        this.notificationTime = `1990-01-01T${("0" + val[0]).slice(-2)}:${("0" + val[1]).slice(-2)}Z`;
    }).catch((error) => {

  setNotificationTime(): void {
    let dt = new Date(this.notificationTime);
    let time = [dt.getHours(), dt.getMinutes()]