diff --git a/app/services/post_alerter.rb b/app/services/post_alerter.rb
index 02924fa3cda..79d8b7e71ba 100644
--- a/app/services/post_alerter.rb
+++ b/app/services/post_alerter.rb
@@ -101,7 +101,7 @@ class PostAlerter
       if post.topic.private_message?
         notify_pm_users(post, reply_to_user, notified)
       elsif notify_about_reply?(post)
-        notify_post_users(post, notified)
+        notify_post_users(post, notified, new_record: new_record)
       end
     end
 
@@ -566,7 +566,7 @@ class PostAlerter
     end
   end
 
-  def notify_post_users(post, notified, include_category_watchers: true, include_tag_watchers: true)
+  def notify_post_users(post, notified, include_category_watchers: true, include_tag_watchers: true, new_record: false)
     return unless post.topic
 
     warn_if_not_sidekiq
@@ -627,7 +627,7 @@ class PostAlerter
     already_seen_user_ids = Set.new TopicUser.where(topic_id: post.topic.id).where("highest_seen_post_number >= ?", post.post_number).pluck(:user_id)
 
     each_user_in_batches(notify) do |user|
-      notification_type = already_seen_user_ids.include?(user.id) ? Notification.types[:edited] : Notification.types[:posted]
+      notification_type = !new_record && already_seen_user_ids.include?(user.id) ? Notification.types[:edited] : Notification.types[:posted]
       opts = {}
       opts[:display_username] = post.last_editor.username if notification_type == Notification.types[:edited]
       create_notification(user, notification_type, post, opts)
diff --git a/spec/services/post_alerter_spec.rb b/spec/services/post_alerter_spec.rb
index f3794d8bcb2..35c4b866ffd 100644
--- a/spec/services/post_alerter_spec.rb
+++ b/spec/services/post_alerter_spec.rb
@@ -1130,6 +1130,7 @@ describe PostAlerter do
     fab!(:post) { Fabricate(:post, topic: topic) }
     fab!(:last_editor) { Fabricate(:user) }
     fab!(:tag) { Fabricate(:tag) }
+    fab!(:category) { Fabricate(:category) }
 
     it 'creates single edit notification when post is modified' do
       TopicUser.create!(user_id: user.id, topic_id: topic.id, notification_level: TopicUser.notification_levels[:watching], highest_seen_post_number: post.post_number)
@@ -1142,5 +1143,26 @@ describe PostAlerter do
       PostAlerter.new.notify_post_users(post, [])
       expect(Notification.count).to eq(1)
     end
+
+    it 'creates posted notification when Sidekiq is slow' do
+      CategoryUser.set_notification_level_for_category(user, CategoryUser.notification_levels[:watching], category.id)
+
+      post = PostCreator.create!(
+        Fabricate(:user),
+        title: "one of my first topics",
+        raw: "one of my first posts",
+        category: category.id
+      )
+
+      TopicUser.change(user, post.topic_id, highest_seen_post_number: post.post_number)
+
+      # Manually run job after the user read the topic to simulate a slow
+      # Sidekiq.
+      job_args = Jobs::PostAlert.jobs[0]['args'][0]
+      expect { Jobs::PostAlert.new.execute(job_args.with_indifferent_access) }
+        .to change { Notification.count }.by(1)
+
+      expect(Notification.last.notification_type).to eq(Notification.types[:posted])
+    end
   end
 end