Execute chunk tasks while waiting for chunk load in isChunkGenerated

this shouldn't be needed as we are requesting EMPTY status, however there is a deeper issue that we will just work around for now

fixes #10916

patches/server/1027-Fix-CraftWorld-isChunkGenerated.patch

@@ -6,10 +6,10 @@ Subject: [PATCH] Fix CraftWorld#isChunkGenerated
 The upstream implementation is returning true for non-full chunks.
 
 diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
-index fe9e8d1d4ae1f7a4e8f4cf5688004fc969422b3c..95de729f0a02a202632ea85a4061607d632588e9 100644
+index fe9e8d1d4ae1f7a4e8f4cf5688004fc969422b3c..1e7e8e0425dfde875bd79be4432eb7a092d70e4b 100644
 --- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
 +++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
-@@ -367,11 +367,27 @@ public class CraftWorld extends CraftRegionAccessor implements World {
+@@ -367,11 +367,28 @@ public class CraftWorld extends CraftRegionAccessor implements World {
  
      @Override
      public boolean isChunkGenerated(int x, int z) {
@@ -31,6 +31,7 @@ index fe9e8d1d4ae1f7a4e8f4cf5688004fc969422b3c..95de729f0a02a202632ea85a4061607d
 +        ca.spottedleaf.moonrise.patches.chunk_system.ChunkSystem.scheduleChunkLoad(
 +            this.world, x, z, false, ChunkStatus.EMPTY, false, ca.spottedleaf.concurrentutil.executor.standard.PrioritisedExecutor.Priority.NORMAL, future::complete
 +        );
++        world.getChunkSource().mainThreadProcessor.managedBlock(future::isDone);
 +        return future.thenApply(c -> {
 +            if (c != null) {
 +                return c.getPersistedStatus() == ChunkStatus.FULL;