Fix hashtags not being federated on mentions (fixes #6900) (#7406)

app/services/post_status_service.rb

@@ -35,8 +35,8 @@ class PostStatusService < BaseService
                                         application: options[:application])
     end
 
-    process_mentions_service.call(status)
     process_hashtags_service.call(status)
+    process_mentions_service.call(status)
 
     LinkCrawlWorker.perform_async(status.id) unless status.spoiler_text?
     DistributionWorker.perform_async(status.id)