Modal still overlay after dismiss

When I this.viewCtrl.dismiss() a modal. It doesn’t fully dismiss.

uploadingPage.onDidDismiss(data => {
    console.log("isOverlay", uploadingPage.isOverlay);

Will output true.

If I add a background to ion-modal after dismissing I still see the background.

ion-modal {
    background: rgba(0, 89, 148, 0.21);

Does somebody have an idea of what could cause this ?

ionic-angular: 3.9.2

Thanks !