Required string query parameters are displayed as Nullable

I am using latest version of Nswag (V13.xx) along with OpenApiDocument.

The string query parameters are displayed as Nullable on Swagger document when using both [Required] [FromQuery] attributes or only the [Required] attribute. Below is the code sample:

public ActionResult<List<Dictionary<string, string>>> Get([Required] [FromQuery] string format) { .... }

Is there another way to make Nswag to no display the string query parameter as Nullable?

Thanks

[RicoSuter]

Use [BindRequired] and not [Required]

[RicoSuter]

Updated wiki - please also improve the wiki if you have time and it makes sense, etc.