Fix spigot's Forced-Stats

moves the loading after vanilla loading, so it overrides the values.
disables saving any forced stats, so it stays at the same value (without enabling disableStatSaving)
fixes stat initialization to not cause a NullPointerException

paper-server/patches/sources/net/minecraft/stats/ServerStatsCounter.java.patch

@@ -5,21 +5,22 @@
  package net.minecraft.stats;
  
  import com.google.common.collect.Maps;
-@@ -47,6 +48,13 @@
-     public ServerStatsCounter(MinecraftServer server, File file) {
-         this.server = server;
-         this.file = file;
+@@ -57,9 +58,22 @@
+             }
+         }
+ 
++        // Paper start - Moved after stat fetching for player state file
++        // Moves the loading after vanilla loading, so it overrides the values.
++        // Disables saving any forced stats, so it stays at the same value (without enabling disableStatSaving)
++        // Fixes stat initialization to not cause a NullPointerException
 +        // Spigot start
 +        for ( Map.Entry<ResourceLocation, Integer> entry : org.spigotmc.SpigotConfig.forcedStats.entrySet() )
 +        {
-+            Stat<ResourceLocation> wrapper = Stats.CUSTOM.get( entry.getKey() );
++            Stat<ResourceLocation> wrapper = Stats.CUSTOM.get(java.util.Objects.requireNonNull(BuiltInRegistries.CUSTOM_STAT.getValue(entry.getKey()))); // Paper - ensured by SpigotConfig#stats
 +            this.stats.put( wrapper, entry.getValue().intValue() );
 +        }
 +        // Spigot end
-         if (file.isFile()) {
-             try {
-                 this.parseLocal(server.getFixerUpper(), FileUtils.readFileToString(file));
-@@ -60,6 +68,7 @@
++        // Paper end - Moved after stat fetching for player state file
      }
  
      public void save() {
@@ -27,15 +28,16 @@
          try {
              FileUtils.writeStringToFile(this.file, this.toJson());
          } catch (IOException ioexception) {
-@@ -70,6 +79,7 @@
+@@ -70,6 +84,8 @@
  
      @Override
      public void setValue(Player player, Stat<?> stat, int value) {
 +        if ( org.spigotmc.SpigotConfig.disableStatSaving ) return; // Spigot
++        if (stat.getType() == Stats.CUSTOM && stat.getValue() instanceof final ResourceLocation resourceLocation && org.spigotmc.SpigotConfig.forcedStats.get(resourceLocation) != null) return; // Paper - disable saving forced stats
          super.setValue(player, stat, value);
          this.dirty.add(stat);
      }
-@@ -158,13 +168,12 @@
+@@ -158,13 +174,12 @@
      }
  
      private <T> Optional<Stat<T>> getStat(StatType<T> type, String id) {