No input field null validation on non nullable fields

Why is this working on cloud but not when self-hosted ?

On Cloud I have the error : couldn't rewrite mutation addUser because failed to rewrite mutation payload because type User requires a value for field name, but no value present

Same scenario on a fresh dgraph/standalone:v21.03.2 and dgraph/standalone:latest, the mutation is allowed.

I tried to set alpha flag --limit mutations=strict but this does not seem to change anything.