.Net: Bug: ImportPluginFromOpenApiAsync with multipart/form-data not working

[dariomalfatti-centropaghe]

Describe the bug
Importing an OpenAPI json file generated by Swagger that include multipart/form-data body content got the error:
Microsoft.SemanticKernel.KernelException: Neither of the media types of is supported.

Manually removing the API with this kind of content, it works.

To Reproduce
Import a json file with an API like this example:

"/api/mensatest/ExcelImport/QuickImport": {
      "post": {
        "tags": [
          "ExcelImport"
        ],
        "requestBody": {
          "content": {
            "multipart/form-data": {
              "schema": {
                "type": "object",
                "properties": {
                  "File": {
                    "type": "string",
                    "format": "binary"
                  }
                }
              },
              "encoding": {
                "File": {
                  "style": "form"
                }
              }
            }
          }
        },
        "responses": {
          "200": {
            "description": "Success",
            "content": {
              "text/plain": {
                "schema": {
                  "$ref": "#/components/schemas/ImportResultModelGenericResult"
                }
              },
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/ImportResultModelGenericResult"
                }
              },
              "text/json": {
                "schema": {
                  "$ref": "#/components/schemas/ImportResultModelGenericResult"
                }
              }
            }
          },
          "401": {
            "description": "Unauthorized"
          },
          "403": {
            "description": "Forbidden"
          }
        },
        "security": [
          {
            "oauth2": [ ]
          }
        ]
      }
    },

Expected behavior
I'm was expecting that the file was correcly processed, ignoring the API with multipart/form-data content though.

Platform

• OS: Windows 10
• IDE: Visual Studio 2022
• Language: C#
• Source: NuGet package Microsoft.SemanticKernel.Core 1.20.0