Cache Not Returning Results in Loop When Changed

In order to reduce memory consumption on an API call (using ruby-grape) I'm attempting to calculate data in a background job (Delayed Job, eventually Sidekiq), populate a Redis cache and return the results.

Here is the DelayedJob that populates the cache

class LotService  def self.cache_recently_removed_lot_ids    lot_ids = Lot.ids_removed_from_syndication_in_last(60)    lot_ids.concat Lot.ids_hidden_in_last(60)    lot_ids.concat Lot.ids_unpublished_in_last(60)    Rails.cache.write(:recently_removed_lot_ids, lot_ids, expires_at: DateTime.current + 1.hour)  endend

Here is the API endpoint. Within the 10.times iteration the Cache results never return. If I make a subsequent call to the API endpoint the results are there.

lot_ids = []10.times do |iteration|  lot_ids = Rails.cache.read(:recently_removed_lot_ids)  break if lot_ids.present?  # Run on first iteration and if job isn't already queued  LotsRecentlyRemovedCacheJob.perform_later if    !LotsRecentlyRemovedCacheJob.already_queued? && iteration.zero?  sleep 2endcontent_type 'application/json'lot_ids.present? ? lot_ids.sort! : []

Why would the iterative calls to Rails.cache.read not return a result once the cache had been populated by the background job?