OpenAPI 3: "attribute does not allow null values" in ResponseValidation

[aaron-collier]

I have a property in a response defined as:

        filename:
          nullable: true
          type: string

but when empty:

{"id":"invalid_response","message":"...properties/filename does not allow null values"}

[geemus]

@aaron-collier Hey, I was trying to pin this down today without much luck so far. Could you share a bit broader chunk of schema that reproduces the error?