[FromQuery] Bug Reproduction

Incorrect behaviour with Implicit-Required on [FromQuery] in Microsoft.AspNetCore.OpenAPI

Attempting to call /weatherforecast without a city query parameter will, correctly, fail with

{
  "type": "https://tools.ietf.org/html/rfc9110#section-15.5.1",
  "title": "One or more validation errors occurred.",
  "status": 400,
  "errors": {
    "City": [
      "The City field is required."
    ]
  },
  "traceId": "00-b60d49f5662be73508730192b2ffd1e2-9951b7eb55e622f8-00"
}

Attempting to call /weatherforecast?city=London will succeed.

However, the OpenAPI Schema at /openapi/v1.json does not list the city parameter as "required": true

{
  "openapi": "3.1.1",
  "info": {
    "title": "WebApplication1 | v1",
    "version": "1.0.0"
  },
  "servers": [
    {
      "url": "http://localhost:5182/"
    }
  ],
  "paths": {
    "/WeatherForecast": {
      "get": {
        "tags": [
          "WeatherForecast"
        ],
        "operationId": "GetWeatherForecast",
        "parameters": [
          {
            "name": "City",
            "in": "query",
            "schema": {
              "type": "string"
            }
          }
        ],
        "responses": {
          "200": {
            "description": "OK",
            "content": {
              "text/plain": {
                "schema": {
                  "type": "array",
                  "items": {
                    "$ref": "#/components/schemas/WeatherForecast"
                  }
                }
              },
              "application/json": {
                "schema": {
                  "type": "array",
                  "items": {
                    "$ref": "#/components/schemas/WeatherForecast"
                  }
                }
              },
              "text/json": {
                "schema": {
                  "type": "array",
                  "items": {
                    "$ref": "#/components/schemas/WeatherForecast"
                  }
                }
              }
            }
          }
        }
      }
    }
  },
  "components": {
    "schemas": {
      "WeatherForecast": {
        "type": "object",
        "properties": {
          "date": {
            "type": "string",
            "format": "date"
          },
          "temperatureC": {
            "pattern": "^-?(?:0|[1-9]\\d*)$",
            "type": [
              "integer",
              "string"
            ],
            "format": "int32"
          },
          "temperatureF": {
            "pattern": "^-?(?:0|[1-9]\\d*)$",
            "type": [
              "integer",
              "string"
            ],
            "format": "int32"
          },
          "summary": {
            "type": [
              "null",
              "string"
            ]
          }
        }
      }
    }
  },
  "tags": [
    {
      "name": "WeatherForecast"
    }
  ]
}