ExceptionHandler in the controller is not displayed when the controller is AOP Proxy class.

[uc4w6c]

Describe the bug
If i add the Validated annotation etc. to the controller, it will become an AOP Proxy class, but the response returned by ExceptionHandler will not be displayed.

To Reproduce
GET /exception

@RestController
@RequestMapping("exception")
@Validated
public class ExceptionController {
  @GetMapping
  public String index() {
    throw new ExampleException();
  }

  @ExceptionHandler(ExampleException.class)
  @ResponseStatus(HttpStatus.BAD_REQUEST)
  @ApiResponse(responseCode = "400", description = "bad request")
  public String customControllerException() {
    return "exception1";
  }
}

Expected behavior

Actual

		"/exception": {
			"get": {
                                 ...
				"responses": {
					"200": {
                                          ...
					},
					"400": {
                                          ...
					}
				}
			}
		}

Expected:

		"/exception": {
			"get": {
                                 ...
				"responses": {
					"200": {
                                          ...
					}
				}
			}
		}