ngModel does not work on modal page in Ionic 6

I am developing an Ionic/Angular app and wanted to use ngModel as alwayls. I am opening a modal from a modal and then want to use it like:

<ion-list>
<ion-item>
  <ion-label position="stacked">Name des Rezepts</ion-label>
  <ion-input [(ngModel)]="model" ></ion-input>
</ion-item>
</ion-list>
<ion-button (click)="save()">Save</ion-button>

i declared the variable in typescript like:

public model="";

But when i click save, my output IS ALWAYS the empty string?!

I imported ReactiveFormsModule in my app.module.ts and on normal pages it works, but in modals it seems like that it does not work?!

Do you guys have any ideas? Thank you!