Fix missing Remote marker on entities spawned by other components

Closes #672.

Author: Shatur

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+
+- Entities spawned during component deserialization now also get the `Remote` marker.
+
 ## [0.39.1] - 2026-03-09
 
 ### Fixed

src/client.rs

@@ -537,7 +537,13 @@ fn apply_changes(
                 return Ok(());
             };
 
-            DeferredEntity::new(client_entity, params.changes)
+            let mut client_entity = DeferredEntity::new(client_entity, params.changes);
+            if !client_entity.contains::<Remote>() {
+                // Even though the entity already exists, it could have been spawned during
+                // deserialization of another component and doesn't have the marker yet.
+                client_entity.insert(Remote);
+            }
+            client_entity
         }
         EntityEntry::Vacant(entry) => {
             let mut client_entity = DeferredEntity::new(world.spawn_empty(), params.changes);

tests/spawn.rs

@@ -149,6 +149,40 @@ fn old_component() {
     assert_eq!(components.iter(client_app.world()).count(), 1);
 }
 
+#[test]
+fn related() {
+    let mut server_app = App::new();
+    let mut client_app = App::new();
+
+    for app in [&mut server_app, &mut client_app] {
+        app.add_plugins((
+            MinimalPlugins,
+            StatesPlugin,
+            RepliconPlugins.set(ServerPlugin::new(PostUpdate)),
+        ))
+        .replicate::<ChildOf>()
+        .finish();
+    }
+
+    server_app.connect_client(&mut client_app);
+
+    let server_parent = server_app.world_mut().spawn(Replicated).id();
+    server_app
+        .world_mut()
+        .spawn((Replicated, ChildOf(server_parent)));
+
+    server_app.update();
+    server_app.exchange_with_client(&mut client_app);
+    client_app.update();
+    server_app.exchange_with_client(&mut client_app);
+
+    let mut children = client_app.world_mut().query::<&ChildOf>();
+    assert_eq!(children.iter(client_app.world()).len(), 1);
+
+    let mut remote = client_app.world_mut().query::<&Remote>();
+    assert_eq!(remote.iter(client_app.world()).len(), 2);
+}
+
 #[test]
 fn empty_before_connection() {
     let mut server_app = App::new();