defining initialize for a controller causes that no layout is rendered

Defining initialize for a controller causes that no layout is rendered, except it is passed as option for render. It is probably not intended (filters), but was possible in Rails 2.

class EntriesController < ApplicationController
  layout 'some_layout' # or 'application' or none

  def initialize
    :blubb
  end

  # does not work:
  def show
  end

  def index
    render :action => 'index'
  end

  # does work
  def new
    render :action => 'new', :layout => 'some_layout'
  end

  # ...