This could instead be an issue with the React docs rather than with Next, but the CodeSandbox example in the docs (you can access it directly via the "fork" link) indeed appears to be a server ...

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I am upgrading from 7.52.1 to 7.63.0 (also verified regression with 7.64.0) and I have an existing scenario that is now broken: Go to this codesandbox Either delete all field-rows or append until 4 is ...