fix pregen save chunk failing

core/src/main/java/com/volmit/iris/core/pregenerator/methods/AsyncPregenMethod.java

@@ -23,16 +23,17 @@ import com.volmit.iris.core.IrisSettings;
 import com.volmit.iris.core.pregenerator.PregenListener;
 import com.volmit.iris.core.pregenerator.PregeneratorMethod;
 import com.volmit.iris.core.tools.IrisToolbelt;
+import com.volmit.iris.util.collection.KList;
 import com.volmit.iris.util.collection.KMap;
 import com.volmit.iris.util.mantle.Mantle;
 import com.volmit.iris.util.math.M;
 import com.volmit.iris.util.parallel.MultiBurst;
-import com.volmit.iris.util.scheduling.J;
 import org.bukkit.Chunk;
 import org.bukkit.World;
 
 import java.lang.reflect.InvocationTargetException;
 import java.util.Map;
+import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.Semaphore;
@@ -58,26 +59,28 @@ public class AsyncPregenMethod implements PregeneratorMethod {
 
     private void unloadAndSaveAllChunks() {
         try {
-            J.sfut(() -> {
             if (world == null) {
                 Iris.warn("World was null somehow...");
                 return;
             }
 
             long minTime = M.ms() - 10_000;
+            KList<CompletableFuture<?>> futures = new KList<>();
             lastUse.entrySet().removeIf(i -> {
                 final Chunk chunk = i.getKey();
                 final Long lastUseTime = i.getValue();
                 if (!chunk.isLoaded() || lastUseTime == null)
                     return true;
                 if (lastUseTime < minTime) {
-                        chunk.unload();
+                    futures.add(Iris.platform.getRegionScheduler()
+                            .run(chunk.getWorld(), chunk.getX(), chunk.getZ(), () -> chunk.unload())
+                            .getResult());
                     return true;
                 }
                 return false;
             });
-                world.save();
+            futures.add(Iris.platform.getRegionScheduler().run(world, 0, 0, world::save).getResult());
-            }).get();
+            CompletableFuture.allOf(futures.toArray(CompletableFuture[]::new)).join();
         } catch (Throwable e) {
             e.printStackTrace();
         }