PaperMC/patches/server/1019-Fix-missing-map-initialize-event-call.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Warrior <50800980+Warriorrrr@users.noreply.github.com>
Date: Sun, 24 Sep 2023 18:35:28 +0200
Subject: [PATCH] Fix missing map initialize event call

== AT ==
public net.minecraft.world.level.storage.DimensionDataStorage readSavedData(Ljava/util/function/Function;Lnet/minecraft/util/datafix/DataFixTypes;Ljava/lang/String;)Lnet/minecraft/world/level/saveddata/SavedData;

diff --git a/src/main/java/net/minecraft/server/level/ServerLevel.java b/src/main/java/net/minecraft/server/level/ServerLevel.java
index 8f85aafb181cadd2983b0f3735782729858226c6..b78a9628a88f2a495ef6de74446a02a14d41a1f6 100644
--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
+++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
@@ -2129,13 +2129,25 @@ public class ServerLevel extends Level implements WorldGenLevel {
     @Nullable
     @Override
     public MapItemSavedData getMapData(String id) {
-        // CraftBukkit start
-        MapItemSavedData worldmap = (MapItemSavedData) this.getServer().overworld().getDataStorage().get(MapItemSavedData.factory(), id);
-        if (worldmap != null) {
-            worldmap.id = id;
+        // Paper start - Call missing map initialize event & set id
+        final DimensionDataStorage storage = this.getServer().overworld().getDataStorage();
+
+        final net.minecraft.world.level.saveddata.SavedData existing = storage.cache.get(id);
+        if (existing == null && !storage.cache.containsKey(id)) {
+            final net.minecraft.world.level.saveddata.SavedData.Factory<MapItemSavedData> factory = MapItemSavedData.factory();
+            final MapItemSavedData map = storage.readSavedData(factory.deserializer(), factory.type(), id);
+            storage.cache.put(id, map);
+            if (map != null) {
+                map.id = id;
+                new MapInitializeEvent(map.mapView).callEvent();
+                return map;
+            }
+        } else if (existing instanceof MapItemSavedData mapItemSavedData) {
+            mapItemSavedData.id = id;
         }
-        return worldmap;
-        // CraftBukkit end
+
+        return existing instanceof MapItemSavedData data ? data : null;
+        // Paper end
     }
 
     @Override