has_one SQL not using LIMIT when using include

I have the following model:

class Foo < ActiveRecord::Base
  has_many :messages
  has_one :last_message, -> { order(created_at: :desc) }, class_name: 'Message'
end

and following resource:

class FooResource < JSONAPI::Resource
  has_one :last_message, class_name: 'Message'
end

When I request /foo/1/last-message it generates the following SQL:

SELECT  `messages`.* FROM `messages` WHERE `messages`.`foo_id` = 1  ORDER BY `messages`.`created_at` DESC LIMIT 1

But when I request /foo/1?include=last-message, the SQL doesnt append LIMIT

SELECT `messages`.* FROM `messages` WHERE `messages`.`foo_id` IN (1)  ORDER BY `messages`.`created_at` DESC

Reproduce the two requests shown in the issue and compare the generated SQL for the direct relationship and the included relationship. Trace the include-loading entry point to find where the has_one scope is applied, then verify that the included query preserves the single-record limit and ordering.