nullable field throw validation error if null

[isaac-merkos]

The request body is types

{
    field:Date | null
}

The generated schema is as expected, the field is required but nullable, but when I send a body with a null value in the field I get this error

Caught Validation Error for /route: {
  'body.field': {
    message: 'invalid ISO 8601 datetime format, i.e. YYYY-MM-DDTHH:mm:ss',
    value: null
  }
}

It works fine when there is a value but not when it's null

[isaac-merkos]

I can confirm this only happens with Date and not string