The consumer POM on which we have removed dependencies become a parent POM for each Java module, so its packaging should be "pom".

Author: desruisseaux

impl/maven-core/src/main/java/org/apache/maven/internal/transformation/impl/DefaultConsumerPomBuilder.java

@@ -378,7 +378,7 @@ static Model transformPom(Model model, MavenProject project) {
         var sources = new ProjectSourcesHelper(project);
         if (sources.useModuleSourceHierarchy()) {
             // Dependencies are dispatched by maven-jar-plugin in the POM generated for each module.
-            model = model.withDependencies(null);
+            model = model.withDependencies(null).withPackaging(POM_PACKAGING);
         }
         if (!preserveModelVersion) {
             /*