Issue with through associations

[tagliala]

• describe problem
• add failing spec

Models

class Country < ApplicationRecord
  include ChronoModel::TimeMachine

  has_many :cities, dependent: :destroy
  has_many :schools, through: :cities
end

class City < ApplicationRecord
  include ChronoModel::TimeMachine

  validates :name, presence: true

  belongs_to :country
end

class School < ApplicationRecord
  include ChronoModel::TimeMachine

  belongs_to :city
  has_one :country, through: :city
end

Test

Country.destroy_all
italy = Country.create!(name: 'Italy')
rome = italy.cities.create!(name: 'Rome')
galilei = rome.schools.create!(name: 'G. Galilei')
ts = Time.now
sleep 1
buonarroti = rome.schools.create!(name: 'M. Buonarroti')

Country.as_of(ts).includes(:schools).first.cities.last.schools.map(&:name).sort == [galilei.name]

Expected Result

["G. Galilei"]

Actual Result

["G. Galilei", "M. Buonarroti"]