Fix only one faction having access to Anomaly research in Multifaction

Source/Client/Comp/World/MultiplayerWorldComp.cs

@@ -78,6 +78,18 @@ void RemoveOpponentFaction()
             AddSpectatorFaction();
             RemoveOpponentFaction();
         }
+
+        // Fix old save files by ensuring all factions have access to Anomaly research if
+        // it was enabled. This needs to be done since Anomaly state is shared by all players.
+        var anomaly = Find.Anomaly;
+        // Don't use anomaly.Level, as it'll return 0 due to monolith not being
+        // spawned. If we want to include that check then we'd need to move this
+        // code into a postfix to Building_VoidMonolith:SpawnSetup.
+        if (anomaly.level > 0 && anomaly.monolith != null)
+        {
+            foreach (var (_, data) in factionData)
+                data.researchManager.Notify_MonolithLevelChanged(anomaly.level);
+        }
     }
 
     private void ExposeFactionData()

Source/Client/Factions/FactionCreator.cs

@@ -114,6 +114,10 @@ private static void InitNewGame()
     {
         PawnUtility.GiveAllStartingPlayerPawnsThought(ThoughtDefOf.NewColonyOptimism);
         ResearchUtility.ApplyPlayerStartingResearch();
+        // Initialize anomaly. Since the Anomaly comp is currently shared by all players,
+        // we need to ensure that any new factions have access to anomaly research if
+        // anomaly content was started.
+        Find.ResearchManager.Notify_MonolithLevelChanged(Find.Anomaly.Level);
     }
 
     private static void PrepareGameInitData(int sessionId)

Source/Client/Factions/FactionRepeater.cs

@@ -175,4 +175,18 @@ ref ignore
             );
     }
 
+    [HarmonyPatch(typeof(ResearchManager), nameof(ResearchManager.Notify_MonolithLevelChanged))]
+    static class MonolithLevelChangedPatch
+    {
+        static bool ignore;
+
+        static bool Prefix(int newLevel) =>
+            FactionRepeater.Template(
+                Multiplayer.game?.worldComp.factionData,
+                d => d.researchManager.Notify_MonolithLevelChanged(newLevel),
+                null,
+                ref ignore
+            );
+    }
+
 }

Source/Client/Networking/HostUtil.cs

@@ -150,6 +150,14 @@ private static void SetupGameFromSingleplayer()
 
                     factionData.researchManager.progress = new(playerFactionData.researchManager.progress);
                     factionData.researchManager.techprints = new(playerFactionData.researchManager.techprints);
+                    factionData.researchManager.anomalyKnowledge = new(playerFactionData.researchManager.anomalyKnowledge);
+                    factionData.researchManager.currentAnomalyKnowledgeProjects = new(playerFactionData.researchManager.currentAnomalyKnowledgeProjects ?? Enumerable.Empty<ResearchManager.KnowledgeCategoryProject>());
+                    factionData.researchManager.tabInfoVisibility = new();
+                    if (playerFactionData.researchManager.tabInfoVisibility != null)
+                    {
+                        foreach (var (def, value) in playerFactionData.researchManager.tabInfoVisibility)
+                            factionData.researchManager.tabInfoVisibility[def] = value;
+                    }
                 }
 
             foreach (FactionWorldData data in worldComp.factionData.Values)