Springboot Web mapping same controller as 2 beans

I'm generating controller code from openapi3 spec using gradle openapi generator plugin 6.3.0. Generate, compile works fine, but getting a runtime error:

Caused by: java.lang.IllegalStateException: Ambiguous mapping. Cannot map 'orderApiController' method
com.ab.it.api.OrderApiController#create(OrderReq)
to {POST [/v1/api/orders], consumes [application/json], produces [application/json]}: There is already 'com.ab.it.api.OrderApiController' bean method
com.ab.it.api.OrderApiController#create(OrderReq) mapped.
        at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping$MappingRegistry.validateMethodMapping(AbstractHandlerMethodMapping.java:669) ~[spring-webmvc-5.3.27.jar:5.3.27]

This seems unlikely as both beans 'orderApiController' and 'com.ab.it.api.OrderApiController', seems same, there is no other controller defining 'create' method, or mapping to 'POST [/v1/api/orders]'.

The controller implementing an api interface as:

    @RequestMapping(
        method = RequestMethod.POST,
        value = "/api/orders",
        produces = { "application/json" },
        consumes = { "application/json" }
    )
    public interface OrderApi { ... 

    @Controller
    @RequestMapping("/v1}")
    public class OrderApiController implements OrderApi { ...

What can cause this?

At this point not sure if this is a problem with the generated code or a spring dependency issue.

Using spring boot 2.7.12

  id "org.openapi.generator" version "6.3.0"
  id 'org.springframework.boot' version '2.7.11'

  // spring boot
  implementation platform("org.springframework.boot:spring-boot-dependencies:${springBootVersion}")
  implementation "org.springframework.boot:spring-boot-starter-web"

  implementation "org.springframework:spring-webmvc"

Searched for same method name, and same mapping, did not find any in API spec. Also changed the method name in API spec, but gave the same error.