[BUG] Request model generated in 5.0.0-beta3 but not in 5.0.0 and upwards

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

With version 5.0.0-beta3 everything is fine
In version 5.0.0 (and 5.1.0) the filecreaterequest isn´t created

openapi-generator version

OpenAPI declaration file content or url

	"openapi": "3.0.0",
	"info": {
		"title": "API",
		"description": "Take it, hold it, love it! (convention: snake_case)",
		"version": "1.0.0"
	},
	"servers": [
		{
			"url": "http://localhost:8100"
		}
	],
	"paths": {
		"/api/dms/file/": {
			"post": {
				"tags": ["File"],
				"summary": "Create a new file.",
				"operationId": "uploadFile",
				"requestBody": {
					"content": {
						"multipart/form-data": {
							"schema": {
								"$ref": "#/components/schemas/FileCreateRequest"
							}
						}
					}
				},
				"responses": {
					"200": {
						"description": "The file has been created successfully",
						"content": {
							"application/json": {
								"schema": {
									"$ref": "#/components/schemas/FileCreateResponse"
								}
							}
						}
					},
					"400": {
						"description": "Form Validation Error",
						"content": {
							"application/json": {
								"schema": {
									"$ref": "#/components/schemas/FormErrorResponse"
								}
							}
						}
					}
				}
			}
		}
	},
	"components": {
		"schemas": {
			"FileMetaDto": {
				"properties": {
					"id": {
						"type": "string"
					},
					"filename": {
						"type": "string"
					},
					"title": {
						"type": "string"
					},
					"mime_type": {
						"type": "string"
					},
					"file_size": {
						"title": "Filesize in Bytes",
						"type": "integer"
					},
					"url": {
						"type": "string"
					}
				},
				"type": "object"
			},
			"FormErrorResponse": {
				"properties": {
					"status": {
						"type": "string"
					},
					"errors": {
						"type": "array",
						"items": {
							"$ref": "#/components/schemas/FormError"
						}
					}
				},
				"type": "object"
			},
			"FileCreateRequest": {
				"required": ["uploadedFile"],
				"properties": {
					"directory": {
						"type": "string",
						"format": "Nexus\\Plugin\\DMS\\Entity\\Directory id"
					},
					"title": {
						"type": "string"
					},
					"uploadedFile": {
						"type": "string",
						"format": "binary"
					}
				},
				"type": "object"
			},
			"FileCreateResponse": {
				"properties": {
					"status": {
						"type": "string"
					},
					"id": {
						"description": "The new created contact id",
						"type": "string"
					},
					"file": {
						"$ref": "#/components/schemas/FileMetaDto"
					}
				},
				"type": "object"
			},
			"FormError": {
				"properties": {
					"key": {
						"type": "string"
					},
					"translated_error": {
						"type": "string"
					}
				},
				"type": "object"
			}
		},
		"securitySchemes": {
			"bearerAuth": {
				"type": "apiKey",
				"description": "Value: Bearer {jwt}",
				"name": "Authorization",
				"in": "header"
			}
		}
	},
	"security": [
		{
			"bearerAuth": []
		}
	]
}

Generation Details

openapi-generator generate -i ./spec.json -g typescript

Steps to reproduce

Create the spec.json with the above content and run
openapi-generator generate -i ./spec.json -g typescript

Start by saving the supplied OpenAPI declaration as spec.json and running the documented openapi-generator command with the typescript generator in versions 5.0.0-beta3 and 5.0.0 or later. Compare the generated output for FileCreateRequest, then trace the TypeScript generator's handling of the multipart/form-data request. Done means the request model is generated again for the supplied specification and the regression is covered by a test.