JandexProtoGenerator NPE when generating process with variable of type List

[ERROR] Failed to execute goal io.quarkus:quarkus-maven-plugin:2.2.2.Final:build (default) on project order-saga: Failed to build quarkus application: io.quarkus.builder.BuildException: Build failure: Build failed due to errors
[ERROR] [error]: Build step org.kie.kogito.quarkus.processes.deployment.ProcessesAssetsProcessor#postGenerationProcessing threw an exception: java.lang.RuntimeException: Error while generating proto for model class null null
[ERROR] at org.kie.kogito.codegen.process.persistence.proto.AbstractProtoGenerator.generate(AbstractProtoGenerator.java:143)
[ERROR] at org.kie.kogito.codegen.process.persistence.proto.AbstractProtoGenerator.protoOfDataClasses(AbstractProtoGenerator.java:52)
[ERROR] at org.kie.kogito.codegen.process.persistence.PersistenceGenerator.generateProtoMarshaller(PersistenceGenerator.java:278)
[ERROR] at org.kie.kogito.codegen.process.persistence.PersistenceGenerator.internalGenerate(PersistenceGenerator.java:179)
[ERROR] at org.kie.kogito.codegen.core.AbstractGenerator.generate(AbstractGenerator.java:69)
[ERROR] at org.kie.kogito.quarkus.processes.deployment.ProcessesAssetsProcessor.getGeneratedPersistenceFiles(ProcessesAssetsProcessor.java:227)
[ERROR] at org.kie.kogito.quarkus.processes.deployment.ProcessesAssetsProcessor.generatePersistenceInfo(ProcessesAssetsProcessor.java:190)
[ERROR] at org.kie.kogito.quarkus.processes.deployment.ProcessesAssetsProcessor.postGenerationProcessing(ProcessesAssetsProcessor.java:157)
[ERROR] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[ERROR] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[ERROR] at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[ERROR] at java.base/java.lang.reflect.Method.invoke(Method.java:566)
[ERROR] at io.quarkus.deployment.ExtensionLoader$2.execute(ExtensionLoader.java:820)
[ERROR] at io.quarkus.builder.BuildContext.run(BuildContext.java:277)
[ERROR] at org.jboss.threads.ContextHandler$1.runWith(ContextHandler.java:18)
[ERROR] at org.jboss.threads.EnhancedQueueExecutor$Task.run(EnhancedQueueExecutor.java:2449)
[ERROR] at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1478)
[ERROR] at java.base/java.lang.Thread.run(Thread.java:829)
[ERROR] at org.jboss.threads.JBossThread.run(JBossThread.java:501)
[ERROR] Caused by: java.lang.NullPointerException
[ERROR] at org.kie.kogito.quarkus.processes.deployment.JandexProtoGenerator.isEnum(JandexProtoGenerator.java:91)
[ERROR] at org.kie.kogito.quarkus.processes.deployment.JandexProtoGenerator.isEnum(JandexProtoGenerator.java:51)
[ERROR] at org.kie.kogito.codegen.process.persistence.proto.AbstractProtoGenerator.internalGenerate(AbstractProtoGenerator.java:151)
[ERROR] at org.kie.kogito.codegen.process.persistence.proto.AbstractProtoGenerator.generate(AbstractProtoGenerator.java:136)
[ERROR] ... 18 more