Automapper 11, string to Uri no longer works

Question

since upgrading to automapper 11 trying to map a string to an Uri no longer works

Entity

public sealed class Website
{
    public int Id { get; set; }
    public string Name {get; set; }
    public string BaseAddress { get; set; }
}

object I'm mapping to

public sealed class WebsiteDto
{
    public int Id { get; set; }
    public string Name { get; set; }
    public Uri BaseAddress { get; set; }
}

mapping profile contains

CreateMap<Website, WebsiteDto>();

and how I'm calling it

_mapper.Map<List<WebsiteDto>>(listOfWebsiteEntities);

This was working fine before upgrading to 11, I think it might be a bug but before I raise it as an issue Automapper suggests raising a question here, am I missing something?

after downgrading to automapper 10.1.1 it works again. the upgrade guide doesn't seem to mention anything related to this