Abstract endpoint => Error SyntaxError: Error resolving $ref pointer

[Thaybow]

I get this error on objects declared in a child class
Error reading swagger location http://localhost:8080/v2/api-docs: SyntaxError: Error resolving $ref pointer "http://localhost:8080/v2/api-docs#/definitions/FooDto".
Token "FooDto" does not exist.

This code works if both classes, TypeA and TypeB have just primitive property.

@JsonTypeInfo(
        use = JsonTypeInfo.Id.NAME,
        include = JsonTypeInfo.As.PROPERTY,
        property = "type")
@JsonSubTypes({
        @JsonSubTypes.Type(value = TypeA.class, name = "A"),
        @JsonSubTypes.Type(value = TypeB.class, name = "B")
})
@ApiModel(subTypes = {TypeA.class, TypeB.class}, discriminator = "type",
        description = "Supertype of all type.")
public abstract class AbstractType {

    public abstract String getType();
}

But the same code throws the error when TypeA or TypeB contains a property like :

@ApiModel(value = "TypeA", parent = AbstractType",
public class TypeA extends AbstractType {
@ApiModelProperty(value = "foo")
 private FooDto fooDto;
...
//other dto object
}

The endpoint works properly and returns a json of TypeA or TypeB regarding the case.
And even before, the endpoint was only returning TypeA.class (not AbstractType) and FooDto typescript interface was perfectly generated (and also related restService)

I have the same code for another Abstract class/abstract endpoint where childs contains only string and numbers and no complaints. All is properly generated.

Signature of endpoint where swagger-codegen is issuing:

@ApiOperation(value = "Retrieves a type", response = AbstractType.class)
    @GetMapping(path = "/{id}", produces = APPLICATION_JSON_VALUE)
    public AbstractType getTypeAorB(...){}

springboot 2.6.3
Java 17
angular 9
ng-swagger-gen 1.8.1
pom.xml :

<dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>2.9.2</version>
        </dependency>
<dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-bean-validators</artifactId>
            <version>2.9.2</version>
        </dependency>

I've install json-parser & mustache
codegen is launched via ng-swagger-gen -i http://localhost:8080/v2/api-docs -o src\app\fooProject\api

Any idea? Huge thanks