Is it possible to add a field to an interface in an existing graphql schema?

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Hi,

I’ve tried to add a field to an existing interface, all types that implement this interface have the field, the update of the schema is succesful, and I can see the field in the interface and query it, but it returns only null values, even though there is data for this field. Is there something else I have to do?

I’m using dgraph version 21.03.2

Thanks