update

This "should" fix the Rust server issue... I think?
(Tested local instance on 6000.5.0a7 and it passes everything)

Author: NoelStephensUnity

com.unity.netcode.gameobjects/Runtime/SceneManagement/SceneEventData.cs

@@ -912,7 +912,7 @@ internal void ReadClientReSynchronizationData(FastBufferReader reader)
 
             if (networkObjectsToRemove.Length > 0)
             {
-                var networkObjects = FindObjects.ByType<NetworkObject>();
+                var networkObjects = FindObjects.ByType<NetworkObject>(orderByIdentifier: true);
                 var networkObjectIdToNetworkObject = new Dictionary<ulong, NetworkObject>();
                 foreach (var networkObject in networkObjects)
                 {

com.unity.netcode.gameobjects/Runtime/Spawning/NetworkSpawnManager.cs

@@ -1455,7 +1455,7 @@ internal void DespawnAndDestroyNetworkObjects()
 
         internal void DestroySceneObjects()
         {
-            var networkObjects = FindObjects.ByType<NetworkObject>();
+            var networkObjects = FindObjects.ByType<NetworkObject>(orderByIdentifier: true);
 
             for (int i = 0; i < networkObjects.Length; i++)
             {
@@ -1486,7 +1486,7 @@ internal void DestroySceneObjects()
 
         internal void ServerSpawnSceneObjectsOnStartSweep()
         {
-            var networkObjects = FindObjects.ByType<NetworkObject>();
+            var networkObjects = FindObjects.ByType<NetworkObject>(orderByIdentifier: true);
             var networkObjectsToSpawn = new List<NetworkObject>();
             for (int i = 0; i < networkObjects.Length; i++)
             {

com.unity.netcode.gameobjects/Tests/Runtime/TestHelpers/IntegrationTestSceneHandler.cs

@@ -159,7 +159,7 @@ private static void SceneManager_sceneLoaded(Scene scene, LoadSceneMode loadScen
         private static void ProcessInSceneObjects(Scene scene, NetworkManager networkManager)
         {
             // Get all in-scene placed NeworkObjects that were instantiated when this scene loaded
-            var inSceneNetworkObjects = FindObjects.ByType<NetworkObject>().Where((c) => c.IsSceneObject != false && c.GetSceneOriginHandle() == scene.handle);
+            var inSceneNetworkObjects = FindObjects.ByType<NetworkObject>(orderByIdentifier: true).Where((c) => c.IsSceneObject != false && c.GetSceneOriginHandle() == scene.handle);
             foreach (var sobj in inSceneNetworkObjects)
             {
                 ProcessInSceneObject(sobj, networkManager);
@@ -708,7 +708,7 @@ public void MoveObjectsFromSceneToDontDestroyOnLoad(ref NetworkManager networkMa
         {
             // Create a local copy of the spawned objects list since the spawn manager will adjust the list as objects
             // are despawned.
-            var networkObjects = FindObjects.ByType<NetworkObject>().Where((c) => c.IsSpawned);
+            var networkObjects = FindObjects.ByType<NetworkObject>(orderByIdentifier: true).Where((c) => c.IsSpawned);
             var distributedAuthority = networkManager.DistributedAuthorityMode;
             foreach (var networkObject in networkObjects)
             {