Visual studio item template $safeitemname$ not working as expected

I'm creating a Visual Studio Item template to create a few files which depend on a 'container' file.

The last file <ProjectItem SubType="Code" TargetFileName="$fileinputname$\I$fileinputname$ View.cs" ReplaceParameters="true">Container View.cs</ProjectItem> creates a view interface that expects a certain model type. However the $safeitemname$ parameter didn't work as I expected.

Output Container View.cs file:

public interface IIMy_Triplet_View : IView<IMy_Triplet_View_Model>
{
}

Expected:

public interface IMy_Triplet_View : IView<My_Triplet_Model>
{
}

This is the source for the Container View.cs template:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using WebFormsMvp;

namespace $rootnamespace$
{
    public interface $safeitemname$_View : IView<$safeitemname$_Model>
    {
    }
}

And the .vstemplate file

    <VSTemplate Version="3.0.0" xmlns="http://schemas.microsoft.com/developer/vstemplate/2005" Type="Item">
      <TemplateData>
        <DefaultName>Model-View-Presenter</DefaultName>
        <Name>Model-View-Presenter</Name>
        <Description>Creates a model-view-presenter triplet</Description>
        <ProjectType>CSharp</ProjectType>
        <SortOrder>10</SortOrder>
        <Icon>__TemplateIcon.png</Icon>
        <PreviewImage>__PreviewImage.png</PreviewImage>
      </TemplateData>
      <TemplateContent>
        <References>
          <Reference>
            <Assembly>WebFormsMvp</Assembly>
          </Reference>
        </References>
        <ProjectItem SubType="Code" TargetFileName="$fileinputname$