Fix loading secondary worlds

By: md_5 <git@md-5.net>

paper-server/nms-patches/MinecraftServer.patch

@@ -351,7 +351,7 @@
          BlockPosition blockposition = worldserver.getSpawn();
  
          worldloadlistener.a(new ChunkCoordIntPair(blockposition));
-@@ -379,16 +543,20 @@
+@@ -379,17 +543,21 @@
          chunkproviderserver.addTicket(TicketType.START, new ChunkCoordIntPair(blockposition), 11, Unit.INSTANCE);
  
          while (chunkproviderserver.b() != 441) {
@@ -369,6 +369,7 @@
 -
 -        while (iterator.hasNext()) {
 -            DimensionManager dimensionmanager = (DimensionManager) iterator.next();
+-            ForcedChunk forcedchunk = (ForcedChunk) this.getWorldServer(dimensionmanager).getWorldPersistentData().b(ForcedChunk::new, "chunks");
 +        // CraftBukkit start
 +        // this.nextTick += 100L;
 +        this.executeModerately();
@@ -376,10 +377,11 @@
 +
 +        if (true) {
 +            DimensionManager dimensionmanager = worldserver.worldProvider.getDimensionManager();
++            ForcedChunk forcedchunk = (ForcedChunk) worldserver.getWorldPersistentData().b(ForcedChunk::new, "chunks");
 +            // CraftBukkit end
-             ForcedChunk forcedchunk = (ForcedChunk) this.getWorldServer(dimensionmanager).getWorldPersistentData().b(ForcedChunk::new, "chunks");
  
              if (forcedchunk != null) {
+                 WorldServer worldserver1 = this.getWorldServer(dimensionmanager);
 @@ -404,10 +572,17 @@
              }
          }