Angular reactive form validation for dynamic field during submit

I am using the reactive form with dynamic field (productname). I can throw validation error if the form is submitted without filling the product name.

But when I clicked the Add button, the error "Enter Product Name" is appearing for every new inputs (formControlName="productname"). Also I given the stackblitz link Please someone provide solution https://stackblitz.com/github/reegan2024/mygithubrepo?file=src/app/app.component.html

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