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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 6e9a3b6a1595a1731ca8187d2610c840337a12ed..8b5eabea1a0926c22b58ef8761caee3a06aa5ee0 100644
--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
+++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
@@ -1662,13 +1662,24 @@ public class ServerLevel extends Level implements WorldGenLevel {
     @Nullable
     @Override
     public MapItemSavedData getMapData(MapId id) {
-        // CraftBukkit start
-        MapItemSavedData worldmap = (MapItemSavedData) this.getServer().overworld().getDataStorage().get(MapItemSavedData.factory(), id.key());
-        if (worldmap != null) {
-            worldmap.id = id;
+        // Paper start - Call missing map initialize event and set id
+        final DimensionDataStorage storage = this.getServer().overworld().getDataStorage();
+
+        final net.minecraft.world.level.saveddata.SavedData existing = storage.cache.get(id.key());
+        if (existing == null && !storage.cache.containsKey(id.key())) {
+            final MapItemSavedData worldmap = (MapItemSavedData) this.getServer().overworld().getDataStorage().get(MapItemSavedData.factory(), id.key());
+            storage.cache.put(id.key(), worldmap);
+            if (worldmap != null) {
+                worldmap.id = id;
+                new MapInitializeEvent(worldmap.mapView).callEvent();
+                return worldmap;
+            }
+        } else if (existing instanceof MapItemSavedData mapItemSavedData) {
+            mapItemSavedData.id = id;
         }
-        return worldmap;
-        // CraftBukkit end
+
+        return existing instanceof MapItemSavedData data ? data : null;
+        // Paper end - Call missing map initialize event and set id
     }
 
     @Override