diff --git a/app/models/post_mover.rb b/app/models/post_mover.rb
index 7094f317a56..2cd39b80ae5 100644
--- a/app/models/post_mover.rb
+++ b/app/models/post_mover.rb
@@ -318,7 +318,8 @@ class PostMover
       old_topic_id: original_topic.id,
       new_topic_id: destination_topic.id,
       old_highest_post_number: destination_topic.highest_post_number,
-      old_highest_staff_post_number: destination_topic.highest_staff_post_number
+      old_highest_staff_post_number: destination_topic.highest_staff_post_number,
+      default_notification_level: NotificationLevels.topic_levels[:regular]
     }
 
     DB.exec(<<~SQL, params)
@@ -327,12 +328,9 @@ class PostMover
                               notifications_changed_at, notifications_reason_id)
       SELECT tu.user_id,
              :new_topic_id                               AS topic_id,
-             EXISTS(
-                 SELECT 1
-                 FROM posts p
-                 WHERE p.topic_id = tu.topic_id
-                   AND p.user_id = tu.user_id
-               )                                         AS posted,
+             CASE
+               WHEN p.user_id IS NULL THEN FALSE
+               ELSE TRUE END                             AS posted,
              (
                SELECT MAX(lr.new_post_number)
                FROM moved_posts lr
@@ -353,11 +351,19 @@ class PostMover
              )                                           AS last_emailed_post_number,
              GREATEST(tu.first_visited_at, t.created_at) AS first_visited_at,
              GREATEST(tu.last_visited_at, t.created_at)  AS last_visited_at,
-             tu.notification_level,
+             CASE
+               WHEN p.user_id IS NOT NULL THEN tu.notification_level
+               ELSE :default_notification_level END      AS notification_level,
              tu.notifications_changed_at,
              tu.notifications_reason_id
       FROM topic_users tu
            JOIN topics t ON (t.id = :new_topic_id)
+           LEFT OUTER JOIN
+           (
+             SELECT DISTINCT user_id
+             FROM posts
+             WHERE topic_id = :new_topic_id
+           ) p ON (p.user_id = tu.user_id)
       WHERE tu.topic_id = :old_topic_id
         AND GREATEST(
                 tu.last_read_post_number,
diff --git a/spec/models/post_mover_spec.rb b/spec/models/post_mover_spec.rb
index 604fcc4154d..78c1cc72ade 100644
--- a/spec/models/post_mover_spec.rb
+++ b/spec/models/post_mover_spec.rb
@@ -387,6 +387,13 @@ describe PostMover do
                 last_emailed_post_number: 3,
                 notification_level: :tracking
               )
+              create_topic_user(
+                user2,
+                last_read_post_number: 2,
+                highest_seen_post_number: 2,
+                last_emailed_post_number: 2,
+                notification_level: :tracking
+              )
               create_topic_user(
                 user3,
                 last_read_post_number: 1,
@@ -395,9 +402,10 @@ describe PostMover do
                 notification_level: :watching
               )
 
+              p2.update!(user_id: user2.id)
               new_topic = topic.move_posts(user, [p1.id, p2.id], title: "new testing topic name")
 
-              expect(TopicUser.where(topic_id: topic.id).count).to eq(3)
+              expect(TopicUser.where(topic_id: topic.id).count).to eq(4)
               expect(TopicUser.find_by(topic: topic, user: user))
                 .to have_attributes(
                       last_read_post_number: 4,
@@ -412,6 +420,13 @@ describe PostMover do
                       last_emailed_post_number: 3,
                       notification_level: TopicUser.notification_levels[:tracking]
                     )
+              expect(TopicUser.find_by(topic: topic, user: user2))
+                .to have_attributes(
+                      last_read_post_number: 2,
+                      highest_seen_post_number: 2,
+                      last_emailed_post_number: 2,
+                      notification_level: TopicUser.notification_levels[:tracking]
+                    )
               expect(TopicUser.find_by(topic: topic, user: user3))
                 .to have_attributes(
                       last_read_post_number: 1,
@@ -420,7 +435,7 @@ describe PostMover do
                       notification_level: TopicUser.notification_levels[:watching]
                     )
 
-              expect(TopicUser.where(topic_id: new_topic.id).count).to eq(3)
+              expect(TopicUser.where(topic_id: new_topic.id).count).to eq(4)
               expect(TopicUser.find_by(topic: new_topic, user: user))
                 .to have_attributes(
                       last_read_post_number: 1,
@@ -434,15 +449,23 @@ describe PostMover do
                       last_read_post_number: 2,
                       highest_seen_post_number: 2,
                       last_emailed_post_number: 2,
-                      notification_level: TopicUser.notification_levels[:tracking],
+                      notification_level: TopicUser.notification_levels[:regular],
                       posted: false
                     )
+              expect(TopicUser.find_by(topic: new_topic, user: user2))
+                .to have_attributes(
+                      last_read_post_number: 2,
+                      highest_seen_post_number: 2,
+                      last_emailed_post_number: 2,
+                      notification_level: TopicUser.notification_levels[:tracking],
+                      posted: true
+                    )
               expect(TopicUser.find_by(topic: new_topic, user: user3))
                 .to have_attributes(
                       last_read_post_number: 1,
                       highest_seen_post_number: 2,
                       last_emailed_post_number: 2,
-                      notification_level: TopicUser.notification_levels[:watching],
+                      notification_level: TopicUser.notification_levels[:regular],
                       posted: false
                     )
             end