fix: move main-thread call to be implementation from WorldWrapper (#1991)

- Fixes #1990

worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/BukkitWorld.java

@@ -144,7 +144,7 @@ public class BukkitWorld extends AbstractWorld {
     public List<com.sk89q.worldedit.entity.Entity> getEntities(Region region) {
         World world = getWorld();
 
-        List<Entity> ents = world.getEntities();
+        List<Entity> ents = TaskManager.taskManager().sync(world::getEntities);
         List<com.sk89q.worldedit.entity.Entity> entities = new ArrayList<>();
         for (Entity ent : ents) {
             if (region.contains(BukkitAdapter.asBlockVector(ent.getLocation()))) {
@@ -157,7 +157,9 @@ public class BukkitWorld extends AbstractWorld {
     @Override
     public List<com.sk89q.worldedit.entity.Entity> getEntities() {
         List<com.sk89q.worldedit.entity.Entity> list = new ArrayList<>();
-        for (Entity entity : getWorld().getEntities()) {
+
+        List<Entity> ents = TaskManager.taskManager().sync(getWorld()::getEntities);
+        for (Entity entity : ents) {
             list.add(BukkitAdapter.adapt(entity));
         }
         return list;

worldedit-core/src/main/java/com/fastasyncworldedit/core/wrappers/WorldWrapper.java

@@ -320,12 +320,12 @@ public class WorldWrapper extends AbstractWorld {
 
     @Override
     public List<? extends Entity> getEntities(Region region) {
-        return TaskManager.taskManager().sync(() -> parent.getEntities(region));
+        return parent.getEntities(region);
     }
 
     @Override
     public List<? extends Entity> getEntities() {
-        return TaskManager.taskManager().sync(parent::getEntities);
+        return parent.getEntities();
     }
 
     @Override