Circular reference error in type definitions if subclasses appear before baseclass in schema.

We have the following schema components in our swagger.json file:

```
"Gjennomforing_4_3": {
"type": "object",
"allOf": [
{
"$ref": "#/components/schemas/Tvangsprotokoll"
}
],
"additionalProperties": false
},
"Gjennomforing_4_4": {
"type": "object",
"allOf": [
{
"$ref": "#/components/schemas/Tvangsprotokoll"
}
],
"properties": {
"administrertLegemiddel": {
"type": "string",
"nullable": true
},
"administrertDose": {
"type": "string",
"nullable": true
},
"administrasjonsform": {
"type": "string",
"nullable": true
}
},
"additionalProperties": false
},
"Gjennomforing_4_8": {
"type": "object",
"allOf": [
{
"$ref": "#/components/schemas/Tvangsprotokoll"
}
],
"properties": {
"endringUnderGjForing": {
"$ref": "#/components/schemas/VolvenKodeverkValue9272"
},
"beskrivelseAvGjForing": {
"type": "string",
"nullable": true
},
"endretTidspunkt": {
"type": "string",
"format": "date-time",
"nullable": true
}
},
"additionalProperties": false
},
"Tvangsprotokoll": {
"required": [
"$type"
],
"type": "object",
"properties": {
"$type": {
"type": "string"
},
"id": {
"type": "string",
"format": "uuid"
},
"vedtakId": {
"type": "string",
"format": "uuid"
},
"pasientId": {
"type": "string",
"format": "uuid"
},
"fagligAnsvarlig": {
"$ref": "#/components/schemas/Ansvarlig"
},
"startTidspunkt": {
"type": "string",
"format": "date-time",
"nullable": true
},
"avsluttetTidspunkt": {
"type": "string",
"format": "date-time",
"nullable": true
},
"merknad": {
"type": "string",
"nullable": true
},
"lopenummer": {
"type": "integer",
"format": "int32",
"nullable": true
}
},
"additionalProperties": false,
"discriminator": {
"propertyName": "$type",
"mapping": {
"Gjennomforing_4_3": "#/components/schemas/Gjennomforing_4_3",
"Gjennomforing_4_4": "#/components/schemas/Gjennomforing_4_4",
"Gjennomforing_4_8": "#/components/schemas/Gjennomforing_4_8"
}
}
},
```

After running codegen on this schema the output is the following for the 3 subclasses (`Gjennomforing_4_3`, `Gjennomforing_4_4`, `Gjennomforing_4_8`) of Tvangsprotokoll:


Here the subclasses are extending Tvangsprotokoll instead of the BaseTvangsprotokoll class.

We believe this is a bug with the order they are parsed in. As the Base class come after the subclasses in the schema.components list.
Everything worked fine when we renamed Tvangsprotokoll to Gjennomforing