There is an inconsistent behavior in the MetaTagDescription field within the product registration, which cannot be deleted through the Admin but is possible to delete through API. In the Admin, when clicking "save" with this field empty, the value from the field Description is copied. This scenario doesn't happen when using the API, the value is correctly deleted.

• Click on the product to edit
• Delete the value from the field MetaTagDescription
• Click "save" and return to the product
• Check that the original value is not there anymore, but the value from the description was duplicated

Use the API to delete the undesired value after updating the product in the Admin https://developers.vtex.com/docs/api-reference/catalog-api#put-/api/catalog/pvt/product/-productId-?endpoint=put-/api/catalog/pvt/product/-productId-