Problems with XMLBeans Extension Interfaces Feature

Hello! In our project we are using XMLBeans Extension Interfaces Feature. When we compile the TypeSystem (using SchemaTypeSystemCompiler.compile), we add the jar with our extension classes to classpath parameter. In XMLBeans 2.4 it works perfectly. But when we updated to XMLBeans 5.0.0, we encountered the following error during an extensions validation:

Interface 'SomeInterface' not found."

As far as I understand, this is because org.apache.xmlbeans.impl.config.Parser does not search classes in classpath (only in files).

When we added the sources of the extension interface to the parameters, TypeSystem compiled successfuly. But then we ran into another problem. When XMLBeans generates java files from XSD, it uses simple class names (instead of fully qualified names as it was in XMLBeans 2.4.0) for the classes that are used in methods of the extension interface (like parameters types or return types). And therefore the geneted files cannot be compiled if the extension classes are in a different package.

Are those changes (ingorning classpath when searching for extenstions and using simple names for extenstion classes in code generation instead of fully qualified names) were made intentionally? Such limitations are hard to work around, making an upgrade from older XMLBeans version very complicated.