Problems loading multiple levels with Entity Framework Plus

I'm having trouble with Entity Framework Plus. I can't seem to get the loading of multiple levels working.

The following query works fine. I get the user back with the expected list of addresses.

var user = _dataContext.Users
                .Where(u => u.UserName == username)
                .IncludeFilter(u => u.Addresses.Where(a => !a.Deactivated.HasValue))
                .SingleOrDefault();

But the following query causes it to fall apart.

var user = _dataContext.Users
                .Where(u => u.UserName == username)
                .IncludeFilter(u => u.Addresses.Where(a => !a.Deactivated.HasValue).Select(a => a.AddressType))
                .SingleOrDefault();

I get the user back, but now my list of Addresses is empty.

I'm using EF6 and EF+ v1.7.14.0

Thanks in advance to anyone who can help.

Cheers Craig