Steps to reproduce:

1. Download NB 6.0.1 or http://deadlock.netbeans.org/hudson/job/trunk/lastSuccessfulBuild/artifact/nbbuild/dist/zip/
2. Tools>Options>Editor>Indentation>Number of spaces per indent = 2, tab size = 2
3. Open up a html file (I tried index.html.erb) and paste this code

{{{
<% form_for :model do |f| %>
  <fieldset>
    <legend>Header</legend>
  
    <%= error_messages_for :model %>
  
    <ul>
      
      <li class="submit"><%= submit_tag "Siųsti" %></li>
    </ul>
  </fieldset>
<% end %> 
}}}

4. Define a Ruby code template (I called it ffi):
{{{
<li>
  <label for="${model}_${attr}">${Title}</label>
  <span><%= ${f}.${text_field} :${attr} %></span>
</li>
}}}

5. Put the cursor in the blank line after ul tag.
6. Type ffi<TAB>

Expected result:
{{{
<% form_for :model do |f| %>
  <fieldset>
    <legend>Header</legend>
  
    <%= error_messages_for :model %>
  
    <ul>
      <li>
        <label for="model_attr">Title</label>
        <span><%= f.text_field :attr %></span>      
      </li> 
      <li class="submit"><%= submit_tag "Siųsti" %></li>
    </ul>
  </fieldset>
<% end %> 
}}}

Actual result:
{{{
<% form_for :model do |f| %>
  <fieldset>
    <legend>Header</legend>
  
    <%= error_messages_for :model %>
  
    <ul>
      <li>
          <label for="model_attr">Title</label>
          <span><%= f.text_field :attr %></span>
        </li> 
      <li class="submit"><%= submit_tag "Siųsti" %></li>
    </ul>
  </fieldset>
<% end %> 
}}}

As you can see, everything after li is intented wrongly.