[JAVA] json is adding property twice for classes starting with two capital letters

Description

We are using the swagger-codegen-cli to generate our classes, however, we noticed a strange case where a property that is referenced to (as object) in another .yaml, gets added twice in our json at serialization..
This is possibly caused by the file having a setter/getter with 2 capitals, eg: getDOfferStatus().

Example response:

"result": {
    "dOfferStatus": {
      "href": "",
      "value": "BOOKABLE"
    }
  "dofferStatus":{
      "href":"",
      "value": "BOOKABLE"
    }
 }

Swagger-codegen version

swagger codegen-cli v3

Swagger declaration file content or url

openapi: 3.0.2

info:
  version: 0.14.00
  title: trip offers
  description: trip offers

paths: {}
components:
 schemas:
    TripOfferSummary:
      description: A set of offers for a given trip from origin to destination
      type: object
      properties:
        dOfferStatus:
          $ref: './otheryaml.openapi.yaml#/components/schemas/DOfferStatus'

Which is defined in the other yaml and gets generated inline as: notice we defined it with two capitals as it's a class.

 DOfferStatus:
      type: object
      properties:
        href:
          type: string
          format: uri
        value:
          type: string
          format: urn

Command line used for generation

classpath = project.configurations["swaggerCodegen"]
mainClass = 'io.swagger.codegen.v3.cli.SwaggerCodegen'
args = [
'generate',
'--lang', spring,
'--input-spec', inputFile,
'--config', configFile,
'--output', 'build'
]

config file:
{
"artifactId":"trip-offers-openapi",
"language":"spring",
"modelPackage":"com.system.trip_offers",
"apiPackage":"com.system.api",
"library":"spring-boot",
"generateSupportingFiles":"false",
"interfaceOnly":"true",
"defaultInterfaces":"false",
"singleContentTypes":"true",
"dateLibrary":"java8-localdatetime",
"importMappings": {
"DOfferStatus":"com.otheryamlpackage.DOfferStatus",
}
}

Steps to reproduce

Generate the classes, and serialize/deserialize them.

Suggest a fix/enhancement

I tried using a class by copy pasting the generated code, and added @JsonProperty("dOfferStatus") to the getters and setters of the Java Class. This immediately resolved the issue.

Start with the Java model classes generated by the shown swagger-codegen-cli command and the Spring configuration using the DOfferStatus import mapping. Reproduce serialization with the TripOfferSummary and DOfferStatus schemas, then inspect how the generated getDOfferStatus/setDOfferStatus accessors are handled. Done means serialization emits one correctly cased dOfferStatus property and deserialization remains functional.