fixes #486

src/main/java/carpet/fakes/SpawnHelperInnerInterface.java

@@ -5,4 +5,6 @@ import net.minecraft.util.math.GravityField;
 public interface SpawnHelperInnerInterface
 {
     GravityField getPotentialCalculator();
+
+    int cmGetChunkCount();
 }

src/main/java/carpet/mixins/SpawnHelperInnerMixin.java

@@ -31,12 +31,18 @@ public class SpawnHelperInnerMixin implements SpawnHelperInnerInterface
         cir.setReturnValue(groupToCount.getInt(entityCategory) < i);
     }
 
+
+
     @Override
     public GravityField getPotentialCalculator()
     {
         return densityField;
     }
 
+    @Override
+    public int cmGetChunkCount() {
+        return spawningChunkCount;
+    }
 
 
 }

src/main/java/carpet/script/api/Monitoring.java

@@ -1,5 +1,6 @@
 package carpet.script.api;
 
+import carpet.fakes.SpawnHelperInnerInterface;
 import carpet.script.CarpetContext;
 import carpet.script.Expression;
 import carpet.script.LazyValue;
@@ -30,7 +31,7 @@ public class Monitoring {
             SpawnHelper.Info info = world.getChunkManager().getSpawnInfo();
             if (info == null) return LazyValue.NULL;
             Object2IntMap<SpawnGroup> mobcounts = info.getGroupToCount();
-            int chunks = info.getSpawningChunkCount();
+            int chunks = ((SpawnHelperInnerInterface)info).cmGetChunkCount();
             Value retVal;
             if (lv.size() == 0)
             {