craftbukkit/nms-patches/net/minecraft/world/level/levelgen/MobSpawnerPhantom.patch

--- a/net/minecraft/world/level/levelgen/MobSpawnerPhantom.java
+++ b/net/minecraft/world/level/levelgen/MobSpawnerPhantom.java
@@ -61,7 +61,7 @@
                                                     if (entityphantom != null) {
                                                         entityphantom.snapTo(blockposition1, 0.0F, 0.0F);
                                                         groupdataentity = entityphantom.finalizeSpawn(worldserver, difficultydamagescaler, EntitySpawnReason.NATURAL, groupdataentity);
-                                                        worldserver.addFreshEntityWithPassengers(entityphantom);
+                                                        worldserver.addFreshEntityWithPassengers(entityphantom, org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason.NATURAL); // CraftBukkit
                                                     }
                                                 }
                                             }