Springdoc (OpenAPI 3) SpringBoot not generated correctly - spring-boot

Question

In a spring boot app with kotlin using the controller
// #PostMapping("/:csv", consumes = [MediaType.MULTIPART_FORM_DATA_VALUE]) // variant 1
#PostMapping("/:csv") // variant 2
fun processKontoCsvFile(
#RequestPart("revenues") #NotNull fileWithRevenues: MultipartFile,
#RequestParam("bank") #NotNull bank: Bank
): ResponseEntity<String> {
return ResponseEntity.ok().body(bank.name + " " + fileWithRevenues.name);
}
the openapi is not generated correctly. Either the multipart file cannot be used as a selct (variant 2 above) or the enumeration value for variable bank (variant 1). See attached pictures.
Dependencies used, no extra configuration:
<dependency>
<groupId>org.springdoc</groupId>
<artifactId>springdoc-openapi-data-rest</artifactId>
<version>1.6.11</version>
</dependency>
<dependency>
<groupId>org.springdoc</groupId>
<artifactId>springdoc-openapi-ui</artifactId>
<version>1.6.11</version>
</dependency>
<dependency>
<groupId>org.springdoc</groupId>
<artifactId>springdoc-openapi-kotlin</artifactId>
<version>1.6.11</version>
</dependency>
What is needed to make that work?
Update:
It works with a PathVariable like so. But still don't know why not with a RequestParam
#PostMapping("/{bank}/:csv", consumes = [MediaType.MULTIPART_FORM_DATA_VALUE])
fun processKontoCsvFile(
#RequestPart("revenues") #NotNull fileWithRevenues: MultipartFile,
#PathVariable("bank") #NotNull bank: Bank
): ResponseEntity<String> {
return ResponseEntity.ok().body(bank.name + " " + fileWithRevenues.name);
}