The issue presented in the codesandbox is that address 2 actually registers a group input, an object of street and city, which would provide an object of nulls instead of a nullable value which is way failed in the schema validation. That's not a problem with Controller, you can provide any defaultValue other than undefined.

[MatheusRoichman]

          The issue presented in the codesandbox is that `address 2` actually registers a group input, an object of street and city, which would provide an object of nulls instead of a nullable value which is way failed in the schema validation. That's not a problem with Controller, you can provide any defaultValue other than `undefined`.

Originally posted by @bluebill1049 in #8046 (comment)

@bluebill1049 so what is the solution for it? Like, when working with fields inside a nullable object, prevent creating an object with null values, but instead leaving the object set as null?