AASM after_commit behaviour

aasm_after_commit.rb

# ruby 2.2.2
# activerecord 4.2.3
# aasm 4.2.0

require 'active_record'
require 'aasm'

# Setup a mock AR table
ActiveRecord::Migration.verbose = false
ActiveRecord::Base.establish_connection(:adapter => "sqlite3", :database => ":memory:")
ActiveRecord::Schema.define(:version => 1) do
  create_table :orders do |t|
    t.string :aasm_state
  end
end

# Example record with scope
class Order < ActiveRecord::Base
  include AASM

  aasm do
    state :draft, initial: true
    state :placed

    event :place, after_commit: :log_placed do
      transitions from: :draft, to: :placed
    end
  end

  def log_placed
    logger.info "Order has been placed"
  end
end

o = Order.create!
ActiveRecord::Base.logger = Logger.new(STDOUT)

#
# The behaviour under question starts here
#
Order.transaction do
  o.place!
  raise ActiveRecord::Rollback
end
o.reload
o.logger.info o.aasm_state

# DEBUG -- :    (0.1ms)  begin transaction
# DEBUG -- :    (0.0ms)  SAVEPOINT active_record_1
# DEBUG -- :   SQL (0.1ms)  UPDATE "orders" SET "aasm_state" = ? WHERE "orders"."id" = ?  [["aasm_state", "placed"], ["id", 1]]
# DEBUG -- :    (0.0ms)  RELEASE SAVEPOINT active_record_1
#  INFO -- : Order has been placed
# DEBUG -- :    (0.0ms)  rollback transaction
# DEBUG -- :   Order Load (0.1ms)  SELECT  "orders".* FROM "orders" WHERE "orders"."id" = ? LIMIT 1  [["id", 1]]
#  INFO -- : draft