--- a/net/minecraft/world/entity/monster/EntitySkeleton.java
+++ b/net/minecraft/world/entity/monster/EntitySkeleton.java
@@ -99,7 +99,7 @@
                 this.level().levelEvent((EntityHuman) null, 1048, this.blockPosition(), 0);
             }
 
-        });
+        }, org.bukkit.event.entity.EntityTransformEvent.TransformReason.FROZEN, org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason.FROZEN); // CraftBukkit - add spawn and transform reasons
     }
 
     @Override