Uncaught TypeError: b is undefined when using reflection on a class that implements an interface

[rsv-code]

I've run into an issue I haven't been able to work through with reflection. It occurs when a reflected class implements any interface. The error that's produced is something like this:

Uncaught TypeError: b is undefined

If I remove the interface from the class the error doesn't occur. The error is triggered on Class.getMethods(). I found that I can call Class.getName() without exception, it appears to only be on getMethods().

Class<?> aclass = ...
aclass.getMethods()

Here is my ReflectionSupplierImpl:

public class ReflectionSupplierImpl implements ReflectionSupplier {
    @Override
    public Collection<String> getAccessibleFields(ReflectionContext context, String className) {
        var cls = context.getClassSource().get(className);
        console.get().info("ReflectionSupplierImpl.getAccessibleFields(): " + className);
        var fields = new HashSet<String>();
        for (var field : cls.getFields()) {
            if (field.getAnnotations().get(Reflectable.class.getName()) != null) {
                fields.add(field.getName());
            }
        }
        return fields;
    }

    @Override
    public Collection<MethodDescriptor> getAccessibleMethods(ReflectionContext context, String className) {
        var cls = context.getClassSource().get(className);
        console.get().info("ReflectionSupplierImpl.getAccessibleMethods(): " + className);
        var methods = new HashSet<MethodDescriptor>();
        for (var method : cls.getMethods()) {
            if (method.getAnnotations().get(Reflectable.class.getName()) != null) {
                methods.add(method.getDescriptor());
            }
        }
        return methods;
    }
}

Thanks for your assistance.