[BUG] Failure while generation of server interfaces from openAPI definition file in org.openapitools:openapi-generator-maven-plugin:6.0.0-beta

Description

While generating interfaces from given openapi.yml following exception is thrown

"class io.swagger.parser.OpenAPIParser tried to access protected method 'java.util.List io.swagger.v3.parser.OpenAPIV3Parser.getExtensions()' (io.swagger.parser.OpenAPIParser and io.swagger.v3.parser.OpenAPIV3Parser are in unnamed module of loader org.codehaus.plexus.classworlds.realm.ClassRealm @1046498a)"

openapi-generator version

version: org.openapitools:openapi-generator-maven-plugin:6.0.0-beta

OpenAPI declaration file content or url

Attached as openapi.yaml.txt (otherwise I can't attach it)
File is already correctly validated
openapi.yaml.txt

Generation Details

Using openapi generator as maven plugin

Steps to reproduce

Using openapi-generator as maven plugin
After configuration
mvn clean compile
Maven pom attached as pom.xml.txt
pom.xml.txt
Compilation results in exception

Start by reproducing the failure with the attached pom.xml.txt and openapi.yaml.txt, using the openapi-generator Maven plugin and mvn clean compile. Compare the plugin's parser dependencies with the reported access exception, then verify that generation completes successfully without the interface-generation failure.