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I am using the 2025-10 API version, attempting to create a new connected board column. 

The issue I am having is that the target board is not being connected when I provide a JSON string instead of an object. 

The mutation is (board IDs have been changed):

mutation CreateBoardRelation {
  create_column (
    board_id: 1234567890,
    title: "Group",
    column_type: board_relation,
    defaults: "{\"boardId\":0987654321,\"allowMultipleItems\":false,\"allowCreateReflectionColumn\":true}"
  ) {
    id
    title
    __typename
  }
}

If the defaults are provided as an object, it works as expected. There are no parsing errors in the response.

For additional context, this happens when using Spring Boot’s GraphQLClient to execute the mutation, or when submitting a JSON string via the API Playground. 

It does work when submitting the defaults as an object via the API Playground.

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