craftbukkit/nms-patches/net/minecraft/world/entity/monster/EntityGhast.patch

--- a/net/minecraft/world/entity/monster/EntityGhast.java
+++ b/net/minecraft/world/entity/monster/EntityGhast.java
@@ -318,6 +318,8 @@
 
                     EntityLargeFireball entitylargefireball = new EntityLargeFireball(world, this.ghast, d2, d3, d4, this.ghast.getPower());
 
+                    // CraftBukkit - set bukkitYield when setting explosionpower
+                    entitylargefireball.bukkitYield = entitylargefireball.explosionPower = this.ghast.getPower();
                     entitylargefireball.setPosition(this.ghast.locX() + vec3d.x * 4.0D, this.ghast.e(0.5D) + 0.5D, entitylargefireball.locZ() + vec3d.z * 4.0D);
                     world.addEntity(entitylargefireball);
                     this.chargeTime = -40;