This has been fixed in master branch. Related PR: Fix(GraphQL): Refactor Mutation Rewriter for Add and Update Mutations by vmrajas · Pull Request #7409 · dgraph-io/dgraph · GitHub
Cherry Pick to 20.11: Fix(GraphQL): Refactor Mutation Rewriter for Add and Update Mutations… by vmrajas · Pull Request #7413 · dgraph-io/dgraph · GitHub
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