When prefixItems is used in an array definition, the Example Value of the API in the preview page is displayed as null. ```YAML type: object properties: items: type: array description: The actions of the task. prefixItems: - $ref: './A.yaml' - oneOf: - $ref: './B.yaml' - $ref: './C.yaml' - $ref: './D.yaml' minItems: 3 maxItems: 3 ``` The Example Value of the API in the preview page shows: ```JSON { "itmes": [ null, null, null ] } ```