diff --git a/src/meta/src/stream/scale.rs b/src/meta/src/stream/scale.rs
index 40b3d9ef25a11..82c27b98b2417 100644
--- a/src/meta/src/stream/scale.rs
+++ b/src/meta/src/stream/scale.rs
@@ -190,6 +190,11 @@ pub fn rebalance_actor_vnode(
     actors_to_remove: &BTreeSet<ActorId>,
     actors_to_create: &BTreeSet<ActorId>,
 ) -> HashMap<ActorId, Bitmap> {
+    let actor_ids: BTreeSet<_> = actors.iter().map(|actor| actor.actor_id).collect();
+
+    assert_eq!(actors_to_remove.difference(&actor_ids).count(), 0);
+    assert_eq!(actors_to_create.intersection(&actor_ids).count(), 0);
+
     assert!(actors.len() >= actors_to_remove.len());
 
     let target_actor_count = actors.len() - actors_to_remove.len() + actors_to_create.len();
diff --git a/src/meta/src/stream/stream_manager.rs b/src/meta/src/stream/stream_manager.rs
index 330e6e3e72dd0..dded570921c10 100644
--- a/src/meta/src/stream/stream_manager.rs
+++ b/src/meta/src/stream/stream_manager.rs
@@ -1076,7 +1076,9 @@ mod tests {
                 let actor_locations = fragments
                     .values()
                     .flat_map(|f| &f.actors)
-                    .map(|a| (a.actor_id, parallel_units[&0].clone()))
+                    .sorted_by(|a, b| a.actor_id.cmp(&b.actor_id))
+                    .enumerate()
+                    .map(|(idx, a)| (a.actor_id, parallel_units[&(idx as u32)].clone()))
                     .collect();
 
                 Locations {
@@ -1165,6 +1167,14 @@ mod tests {
         let table_id = TableId::new(0);
         let actors = make_mview_stream_actors(&table_id, 4);
 
+        let StreamingClusterInfo { parallel_units, .. } = services
+            .global_stream_manager
+            .metadata_manager
+            .get_streaming_cluster_info()
+            .await?;
+
+        let parallel_unit_ids = parallel_units.keys().cloned().sorted().collect_vec();
+
         let mut fragments = BTreeMap::default();
         fragments.insert(
             0,
@@ -1174,7 +1184,9 @@ mod tests {
                 distribution_type: FragmentDistributionType::Hash as i32,
                 actors: actors.clone(),
                 state_table_ids: vec![0],
-                vnode_mapping: Some(ParallelUnitMapping::new_single(0).to_protobuf()),
+                vnode_mapping: Some(
+                    ParallelUnitMapping::new_uniform(parallel_unit_ids.into_iter()).to_protobuf(),
+                ),
                 ..Default::default()
             },
         );