Fix advancements not loading

src/main/java/exopandora/worldhandler/WorldHandler.java

@@ -8,7 +8,10 @@ import exopandora.worldhandler.event.ClientEventHandler;
 import exopandora.worldhandler.event.KeyHandler;
 import exopandora.worldhandler.gui.category.Category;
 import exopandora.worldhandler.gui.content.Content;
+import exopandora.worldhandler.helper.AdvancementHelper;
 import exopandora.worldhandler.helper.CommandHelper;
+import net.minecraft.client.Minecraft;
+import net.minecraft.resources.SimpleReloadableResourceManager;
 import net.minecraftforge.api.distmarker.Dist;
 import net.minecraftforge.common.MinecraftForge;
 import net.minecraftforge.eventbus.api.IEventBus;
@@ -34,6 +37,8 @@ public class WorldHandler
 		MinecraftForge.EVENT_BUS.addListener(this::serverStarting);
 		DistExecutor.runWhenOn(Dist.CLIENT, () -> () ->
 		{
+			SimpleReloadableResourceManager manager = (SimpleReloadableResourceManager) Minecraft.getInstance().getResourceManager();
+			manager.addReloadListener(AdvancementHelper.getInstance());
 			ModLoadingContext.get().registerConfig(Type.CLIENT, Config.CLIENT_SPEC, Main.MODID + ".toml");
 			modEventBus.register(Config.class);
 			modEventBus.addListener(Content::createRegistry);

src/main/java/exopandora/worldhandler/gui/content/impl/ContentAdvancements.java

@@ -21,10 +21,10 @@ import exopandora.worldhandler.gui.content.element.impl.ElementPageList;
 import exopandora.worldhandler.gui.logic.ILogicMapped;
 import exopandora.worldhandler.gui.logic.ILogicPageList;
 import exopandora.worldhandler.helper.ActionHelper;
+import exopandora.worldhandler.helper.AdvancementHelper;
 import exopandora.worldhandler.helper.CommandHelper;
 import exopandora.worldhandler.util.ActionHandler;
 import net.minecraft.advancements.Advancement;
-import net.minecraft.advancements.AdvancementManager;
 import net.minecraft.client.Minecraft;
 import net.minecraft.client.resources.I18n;
 import net.minecraft.util.text.TextFormatting;
@@ -46,7 +46,7 @@ public class ContentAdvancements extends Content
 	@Override
 	public void initGui(Container container, int x, int y)
 	{
-		List<Advancement> advancements = new AdvancementManager().getAllAdvancements().stream()
+		List<Advancement> advancements = AdvancementHelper.getInstance().getAdvancements().stream()
 				.filter(advancement -> advancement.getDisplay() != null)
 				.collect(Collectors.toList());
 		

src/main/java/exopandora/worldhandler/helper/AdvancementHelper.java

@@ -0,0 +1,52 @@
+package exopandora.worldhandler.helper;
+
+import java.util.Collection;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.Executor;
+
+import net.minecraft.advancements.Advancement;
+import net.minecraft.advancements.AdvancementManager;
+import net.minecraft.client.Minecraft;
+import net.minecraft.profiler.IProfiler;
+import net.minecraft.resources.IFutureReloadListener;
+import net.minecraft.resources.IResourceManager;
+import net.minecraft.resources.ResourcePackInfo;
+import net.minecraft.resources.ResourcePackType;
+import net.minecraft.resources.SimpleReloadableResourceManager;
+import net.minecraft.tags.NetworkTagManager;
+import net.minecraft.util.Unit;
+import net.minecraftforge.api.distmarker.Dist;
+import net.minecraftforge.api.distmarker.OnlyIn;
+
+@OnlyIn(Dist.CLIENT)
+public class AdvancementHelper implements IFutureReloadListener
+{
+	private static final AdvancementHelper INSTANCE = new AdvancementHelper();
+	private final AdvancementManager manager = new AdvancementManager();
+	
+	@Override
+	public CompletableFuture<Void> reload(IStage stage, IResourceManager resourceManager, IProfiler preparationsProfiler, IProfiler reloadProfiler, Executor backgroundExecutor, Executor gameExecutor)
+	{
+		return CompletableFuture.supplyAsync(() ->
+		{
+			SimpleReloadableResourceManager serverResourceManager = new SimpleReloadableResourceManager(ResourcePackType.SERVER_DATA, Thread.currentThread());
+			Minecraft.getInstance().getResourcePackList().getEnabledPacks().stream().map(ResourcePackInfo::getResourcePack).forEach(serverResourceManager::addResourcePack);
+			serverResourceManager.addReloadListener(new NetworkTagManager());
+			serverResourceManager.addReloadListener(this.manager);
+			return serverResourceManager;
+		}).thenCompose(stage::markCompleteAwaitingOthers).thenAcceptAsync(serverResourceManager ->
+		{
+			serverResourceManager.initialReload(backgroundExecutor, gameExecutor, CompletableFuture.completedFuture(Unit.INSTANCE));
+		});
+	}
+	
+	public Collection<Advancement> getAdvancements()
+	{
+		return this.manager.getAllAdvancements();
+	}
+	
+	public static AdvancementHelper getInstance()
+	{
+		return INSTANCE;
+	}
+}