Relative reference in subdirectory OpenApi document fails to load

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Relative reference in subdirectory OpenApi document fails to load

When loading a document which is splitted into multiple documents relative references are failing to load when a parent document is in a subdirectory.

What happens is, that a System.IO.FileNotFoundException is thrown:

Could not find file '<path to root of document structure>\Pets.json'.
StackTrace:
   at Microsoft.Win32.SafeHandles.SafeFileHandle.CreateFile(String fullPath, FileMode mode, FileAccess access, FileShare share, FileOptions options)
   at Microsoft.Win32.SafeHandles.SafeFileHandle.Open(String fullPath, FileMode mode, FileAccess access, FileShare share, FileOptions options, Int64 preallocationSize, Nullable`1 unixCreateMode)
   at System.IO.Strategies.OSFileStreamStrategy..ctor(String path, FileMode mode, FileAccess access, FileShare share, FileOptions options, Int64 preallocationSize, Nullable`1 unixCreateMode)
   at System.IO.Strategies.FileStreamHelpers.ChooseStrategyCore(String path, FileMode mode, FileAccess access, FileShare share, FileOptions options, Int64 preallocationSize, Nullable`1 unixCreateMode)
   at System.IO.File.OpenRead(String path)
   at Microsoft.OpenApi.Readers.Services.DefaultStreamLoader.<LoadAsync>d__4.MoveNext() in C:\Users\user\source\repos\OpenAPI.NET\src\Microsoft.OpenApi.Readers\Services\DefaultStreamLoader.cs:line 47
   at Microsoft.OpenApi.Readers.Services.OpenApiWorkspaceLoader.<LoadAsync>d__4.MoveNext() in C:\Users\user\source\repos\OpenAPI.NET\src\Microsoft.OpenApi.Readers\Services\OpenApiWorkspaceLoader.cs:line 46
   at Microsoft.OpenApi.Readers.OpenApiYamlDocumentReader.<ReadAsync>d__3.MoveNext() in C:\Users\user\source\repos\OpenAPI.NET\src\Microsoft.OpenApi.Readers\OpenApiYamlDocumentReader.cs:line 105
   at Microsoft.OpenApi.Readers.OpenApiTextReaderReader.<ReadAsync>d__3.MoveNext() in C:\Users\user\source\repos\OpenAPI.NET\src\Microsoft.OpenApi.Readers\OpenApiTextReaderReader.cs:line 83
   at Microsoft.OpenApi.Readers.OpenApiStreamReader.<ReadAsync>d__3.MoveNext() in C:\Users\user\source\repos\OpenAPI.NET\src\Microsoft.OpenApi.Readers\OpenApiStreamReader.cs:line 71
   at Microsoft.OpenApi.Readers.Services.OpenApiWorkspaceLoader.<LoadAsync>d__4.MoveNext() in C:\Users\user\source\repos\OpenAPI.NET\src\Microsoft.OpenApi.Readers\Services\OpenApiWorkspaceLoader.cs:line 47
   at Microsoft.OpenApi.Readers.OpenApiYamlDocumentReader.<ReadAsync>d__3.MoveNext() in C:\Users\user\source\repos\OpenAPI.NET\src\Microsoft.OpenApi.Readers\OpenApiYamlDocumentReader.cs:line 105
   at Microsoft.OpenApi.Readers.OpenApiTextReaderReader.<ReadAsync>d__3.MoveNext() in C:\Users\user\source\repos\OpenAPI.NET\src\Microsoft.OpenApi.Readers\OpenApiTextReaderReader.cs:line 83
   at Microsoft.OpenApi.Readers.OpenApiStreamReader.<ReadAsync>d__3.MoveNext() in C:\Users\user\source\repos\OpenAPI.NET\src\Microsoft.OpenApi.Readers\OpenApiStreamReader.cs:line 71
   at Program.<<Main>$>d__0.MoveNext() in C:\Users\user\source\repos\OpenApiReferencesInSubDirectories\OpenApiReferencesInSubDirectories\Program.cs:line 17

Files to reproduce

OpenApi.NET Version: 1.6.14

using Microsoft.OpenApi.Readers;

OpenApiStreamReader openApiStreamReader = new OpenApiStreamReader(new OpenApiReaderSettings
{
    BaseUrl = new Uri("<path to root of document structure>"),
    ReferenceResolution = ReferenceResolutionSetting.ResolveLocalReferences,
    LoadExternalRefs = true,
});

FileStream fileStream = new FileStream("Root.json", FileMode.Open, FileAccess.Read);

var document =  await openApiStreamReader.ReadAsync(fileStream);

./Root.json

{
  "openapi": "3.0.0",
  "info": {
    "version": "1.0.0",
    "title": "Swagger Petstore",
    "license": {
      "name": "MIT"
    }
  },
  "servers": [
    {
      "url": "http://petstore.swagger.io/v1"
    }
  ],
  "paths": {
    "/pets": {
      "get": {
        "summary": "List all pets",
        "operationId": "listPets",
        "responses": {
          "200": {
            "description": "An array of pets",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "./Directory/AllPets.json#/components/schemas/AllPets"
                }
              }
            }
          }
        }
      }
    }
  }
}

./Directory/AllPets.json

{
  "openapi": "3.0.0",
  "info": {
    "version": "1.0.0",
    "title": "Swagger Petstore"
  },
  "paths": {
  },
  "components": {
    "schemas": {
      "AllPets": {
        "$ref": "./Pets.json#/components/schemas/Pets"
      }
    }
  }
}

./Directory/Pets.json

{
  "openapi": "3.0.0",
  "info": {
    "version": "1.0.0",
    "title": "Swagger Petstore"
  },
  "paths": {
  },
  "components": {
    "schemas": {
      "Pets": {
        "type": "array",
        "items": {
          "$ref": "./Pet.json#/components/schemas/Pet"
        }
      },
      "Pet": {
        "required": [
          "id",
          "name"
        ],
        "properties": {
          "id": {
            "type": "integer",
            "format": "int64"
          },
          "name": {
            "type": "string"
          },
          "tag": {
            "type": "string"
          }
        }
      }
    }
  }
}