--- a/net/minecraft/world/item/MobBucketItem.java
+++ b/net/minecraft/world/item/MobBucketItem.java
@@ -26,6 +26,10 @@
 import net.minecraft.world.level.gameevent.GameEvent;
 import net.minecraft.world.level.material.FluidType;
 
+// CraftBukkit start
+import org.bukkit.event.entity.CreatureSpawnEvent;
+// CraftBukkit end
+
 public class MobBucketItem extends ItemBucket {
 
     private static final MapCodec<EntityTropicalFish.d> VARIANT_FIELD_CODEC = EntityTropicalFish.d.CODEC.fieldOf("BucketVariantTag");
@@ -63,7 +67,7 @@
         }
 
         if (entityinsentient != null) {
-            worldserver.addFreshEntityWithPassengers(entityinsentient);
+            worldserver.addFreshEntityWithPassengers(entityinsentient, CreatureSpawnEvent.SpawnReason.SPAWNER_EGG); // CraftBukkit
             entityinsentient.playAmbientSound();
         }