Marvin Sommer

Related issue: #19425 contains example OpenAPI file and describes the problem ### PR checklist - [x] Read the [contribution guidelines](https://github.com/openapitools/openapi-generator/blob/master/CONTRIBUTING.md). - [x] Pull Request title clearly describes the work in...

##### Description Using inheritance via the normalizer setting REF_AS_PARENT_IN_ALLOF together with Builder generation, yields the following code for toBuilder methods ```Java public Dog.Builder toBuilder() { Dog.Builder builder = new Dog.Builder();...