PaperMC/paper-server/nms-patches/net/minecraft/world/entity/projectile/EntityWitherSkull.patch

--- a/net/minecraft/world/entity/projectile/EntityWitherSkull.java
+++ b/net/minecraft/world/entity/projectile/EntityWitherSkull.java
@@ -21,6 +21,8 @@
 import net.minecraft.world.phys.MovingObjectPosition;
 import net.minecraft.world.phys.MovingObjectPositionEntity;
 
+import org.bukkit.event.entity.ExplosionPrimeEvent; // CraftBukkit
+
 public class EntityWitherSkull extends EntityFireball {
 
     private static final DataWatcherObject<Boolean> DATA_DANGEROUS = DataWatcher.defineId(EntityWitherSkull.class, DataWatcherRegistry.BOOLEAN);
@@ -64,7 +66,7 @@
                     if (entity.isAlive()) {
                         this.doEnchantDamageEffects(entityliving, entity);
                     } else {
-                        entityliving.heal(5.0F);
+                        entityliving.heal(5.0F, org.bukkit.event.entity.EntityRegainHealthEvent.RegainReason.WITHER); // CraftBukkit
                     }
                 }
             } else {
@@ -81,7 +83,7 @@
                 }
 
                 if (b0 > 0) {
-                    ((EntityLiving) entity).addEffect(new MobEffect(MobEffects.WITHER, 20 * b0, 1), this.getEffectSource());
+                    ((EntityLiving) entity).addEffect(new MobEffect(MobEffects.WITHER, 20 * b0, 1), this.getEffectSource(), org.bukkit.event.entity.EntityPotionEffectEvent.Cause.ATTACK); // CraftBukkit
                 }
             }
 
@@ -94,7 +96,15 @@
         if (!this.level.isClientSide) {
             Explosion.Effect explosion_effect = this.level.getGameRules().getBoolean(GameRules.RULE_MOBGRIEFING) ? Explosion.Effect.DESTROY : Explosion.Effect.NONE;
 
-            this.level.explode(this, this.getX(), this.getY(), this.getZ(), 1.0F, false, explosion_effect);
+            // CraftBukkit start
+            // this.level.createExplosion(this, this.locX(), this.locY(), this.locZ(), 1.0F, false, explosion_effect);
+            ExplosionPrimeEvent event = new ExplosionPrimeEvent(this.getBukkitEntity(), 1.0F, false);
+            this.level.getCraftServer().getPluginManager().callEvent(event);
+
+            if (!event.isCancelled()) {
+                this.level.explode(this, this.getX(), this.getY(), this.getZ(), event.getRadius(), event.getFire(), explosion_effect);
+            }
+            // CraftBukkit end
             this.discard();
         }