[BUG] [JAVA] [SPRING] no class SpringDocConfiguration is generated

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
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Description

In a project I can configure to get delegate interfaces and controllers generated.

If however I set reactive=true no class SpringDocConfiguration is generated.

<configuration>
                            <typeMappings>
                                <typeMapping>OffsetDateTime=java.time.LocalDateTime</typeMapping>
                            </typeMappings>
                            <inputSpec>${project.parent.basedir}/openapi-spec/openapi.yaml</inputSpec>
                            <generatorName>spring</generatorName>
                            <apiPackage>${project-base-package}.api</apiPackage>
                            <modelPackage>${project-base-package}.model</modelPackage>
                            <invokerPackage>${project-base-package}.app</invokerPackage>
                            <skipValidateSpec>false</skipValidateSpec>
                            <strictSpec>true</strictSpec>
                            <generateModels>true</generateModels>
                            <generateModelTests>false</generateModelTests>
                            <generateAliasAsModel>false</generateAliasAsModel>
                            <generateApiTests>false</generateApiTests>
                            <configOptions>
                                <openApiNullable>false</openApiNullable>
                                <library>spring-boot</library>
                                <reactive>true</reactive>
                                <delegatePattern>true</delegatePattern>
                                <!--suppress UnresolvedMavenProperty -->
                                <additionalModelTypeAnnotations>@lombok.Builder @lombok.NoArgsConstructor
                                    @lombok.AllArgsConstructor
                                </additionalModelTypeAnnotations>
                            </configOptions>
                        </configuration>

openapi-generator version

6.0.1, maven plugin.

OpenAPI declaration file content or url

https://github.com/Maxxx873/disposable-email-project/blob/main/openapi-spec/openapi.yaml

Generation Details

Steps to reproduce

Related issues/PRs

Suggest a fix

Reproduce the issue with the Maven plugin, the spring generator, the linked OpenAPI declaration, and the shown reactive=true and delegatePattern=true options. Inspect how SpringDocConfiguration generation changes for reactive projects, then verify that the class is generated for this configuration and add or update a regression check if the generator's existing tests cover this path.