Enum type not unmarshalled correctly

[alerosmile]

Describe the bug
Reading the XML file from the attached sample does not work correctly. The value of the enum attribute is always null. This is because the attribute value cannot be converted to an enum. This is the internal exception message:

Exception [EclipseLink-3001] (Eclipse Persistence Services - 4.0.3.v202405220658): org.eclipse.persistence.exceptions.ConversionException
Exception Description: The object [VALUE2], of class [class java.lang.String], could not be converted to [class com.jaxb.test.TestEnum].

The value cannot be converted because the converter does not exist. And that in turn is because the TestEnum class is not read correctly during creation of the JAXBContext. The internals of the creation of the JAXBContext is rather hard to understand but it seems that it is missing nested types.

Should the @XmlSeeAlso lookup be recursive? Or should properties be processed in org.eclipse.persistence.jaxb.compiler.AnnotationsProcessor.processReferencedClass(JavaClass) even if the type is isPostBuilt? I have no clue but that's where it misses the enum type in my case.

To Reproduce
I've include a simple maven project to reproduce the issue.
schema-test.zip