Problem with oneOf default in generated Java client (default value = string in code)

Description

I generated a Java client from a valid schema, but the generated source contains an error

Relevant part of the schema:

"idValue": {
    "oneOf": [{
        "type": "string"
    }, {
        "type": "integer"
    }],
    "default": "string"
}

The generated Java source:

public static final String JSON_PROPERTY_ID_VALUE = "idValue";
private MappingJobIdValue idValue = string;

On complile:

.../MappingJob.java:[138,39] cannot find symbol
  symbol:   variable string
  location: class finance.auxin.restclient.openfigi.model.MappingJob

It happens when I use native and restclient libraries (I didn't test the others)

openapi-generator version

Latest stable (7.7.0)

OpenAPI declaration file content or url

Used schema: https://api.openfigi.com/schema

Generation Details

<plugin>
    <groupId>org.openapitools</groupId>
    <artifactId>openapi-generator-maven-plugin</artifactId>
    <version>7.7.0</version>
    <executions>
        <execution>
            <goals>
                <goal>generate</goal>
            </goals>
            <configuration>
                <inputSpec>https://api.openfigi.com/schema</inputSpec>
                <generatorName>java</generatorName>
                <library>restclient</library>
                <verbose>false</verbose>
                <enablePostProcessFile>false</enablePostProcessFile>
                <generateModelTests>false</generateModelTests>
                <generateApiDocumentation>true</generateApiDocumentation>
                <generateModelDocumentation>true</generateModelDocumentation>
                <cleanupOutput>true</cleanupOutput>
                <configOptions>
                    <packageName>${default.api.package}</packageName>
                    <apiPackage>${default.api.package}.api</apiPackage>
                    <modelPackage>${default.api.package}.model</modelPackage>
                    <openApiNullable>false</openApiNullable>
                    <useJakartaEe>true</useJakartaEe>
                    <dateLibrary>java8</dateLibrary>
                    <generateClientAsBean>true</generateClientAsBean>
                </configOptions>
            </configuration>
        </execution>
    </executions>
</plugin>

Reproduce generation with the linked OpenFIGI schema, Java generator 7.7.0, and the restclient or native library, then inspect the generated MappingJob.java around the idValue field. Compare the emitted default with the oneOf declaration; done means the generated Java source compiles without treating the schema's string default as an unresolved variable.