multpart/form-data single paramter cannot resolve in ui

[ld000]

Describe the bug
if define a method like this

@Operation(summary = "add")
    @PostMapping(value = "/add", produces = MediaType.APPLICATION_JSON_VALUE, consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
    public ResponseEntity<CommonResultResponse> add(@Parameter(description = "content") @RequestPart(value = "content") String content) throws Exception {
        return ResponseHelper.success();
    }

in ui, the parameter content cannot resolve

but more than one parameter can resolve in ui

    @Operation(summary = "add")
    @PostMapping(value = "/add", produces = MediaType.APPLICATION_JSON_VALUE, consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
    public ResponseEntity<CommonResultResponse> add(
                                         @Parameter(description = "content") @RequestPart(value = "content") String content,
                                                    @RequestPart(value = "type") String type
    ) throws Exception {
        return ResponseHelper.success();
    }

To Reproduce
Steps to reproduce the behavior:

• What version of spring-boot you are using?
  2.3.8.RELEASE
• What modules and versions of springdoc-openapi are you using?

<dependency>
        <groupId>org.springdoc</groupId>
        <artifactId>springdoc-openapi-ui</artifactId>
        <version>1.5.9</version>
</dependency>