BUG?: Id Column Name Not Mapping - Reproducible Example

I've managed to revise the Examples.FirstAutomappedProject so that this problem can be reproduced.

Modify the Employee.cs file so that it looks like this:

namespace Examples.FirstAutomappedProject.Entities
{
    public class Employee : EmployeeBase
    {
        public override string Id
        {
            get
            {
                return base.Id;
            }
            set
            {
                base.Id = value;
            }
        }
        public virtual string FirstName { get; set; }
        public virtual string LastName { get; set; }
        public virtual Store Store { get; set; }
    }

    public class EmployeeBase
    {
        public virtual string Id { get; set; }
    }
}

Add an EmployeeMap class that looks like this:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using FluentNHibernate.Automapping.Alterations;
using FluentNHibernate.Automapping;
using Examples.FirstAutomappedProject.Entities;

namespace Examples.FirstAutomappedProject.Overrides
{
    public class EmployeeMap : IAutoMappingOverride<Employee>
    {
        public void Override(AutoMapping<Employee> mapping)
        {
            mapping.Id(x => x.Id, "EmployeeID")
                .GeneratedBy.Assigned();
        }
    }
}

Change the employees in Program.cs to look like this:

                var daisy = new Employee { Id = "harrid", FirstName = "Daisy", LastName = "Harrison" };
                var jack = new Employee { Id = "torraj", FirstName = "Jack", LastName = "Torrance" };
                var sue = new Employee { Id = "walkts", FirstName = "Sue", LastName = "Walkters" };
                var bill = new Employee { Id = "taftbi", FirstName = "Bill", LastName = "Taft" };
                var joan = new Employee { Id = "popejo", FirstName = "Joan", LastName = "Pope" };

And change the CreateAutomappings method of Program.cs to look like this so it outputs the hbm.xml files and uses the overrides:

    static AutoPersistenceModel CreateAutomappings()
    {
        AutoPersistenceModel model = AutoMap.AssemblyOf<Employee>(new ExampleAutomappingConfiguration())
            .Conventions.Add<CascadeConvention>()
            .IgnoreBase<EmployeeBase>()
            .UseOverridesFromAssemblyOf<EmployeeMap>();

        string path = @"c:\HBM";
        model.WriteMappingsTo(path);

        return model;
    }

Here is the hbm.xml that running the program generates:

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" default-access="property" auto-import="true" default-cascade="none" default-lazy="true">
  <class xmlns="urn:nhibernate-mapping-2.2" mutable="true" name="Examples.FirstAutomappedProject.Entities.Employee, Examples.FirstAutomappedProject, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" table="`Employee`">
    <id name="Id" type="System.String, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
      <column name="Id" />
      <generator class="assigned" />
    </id>
    <property name="FirstName" type="System.String, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
      <column name="FirstName" />
    </property>
    <property name="LastName" type="System.String, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
      <column name="LastName" />
    </property>
    <many-to-one cascade="all" class="Examples.FirstAutomappedProject.Entities.Store, Examples.FirstAutomappedProject, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" name="Store">
      <column name="Store_id" />
    </many-to-one>
  </class>
</hibernate-mapping>

As you can see, the column name is Id and not EmployeeID as specified in the mapping override. I know that this has something to do with overriding the Id property from the EmployeeBase class, but I've included the .IgnoreBase() statement in the mappings so I wouldn't think this would be a problem. Can anyone shed some light on this and provide a solution? I'm not sure this is a bug, but I frequently override properties in my base class and need a solution. I appreciate any advice anyone can offer. Thanks!