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

--- a/net/minecraft/world/entity/projectile/EntityFireball.java
+++ b/net/minecraft/world/entity/projectile/EntityFireball.java
@@ -15,11 +15,15 @@
 import net.minecraft.world.phys.MovingObjectPosition;
 import net.minecraft.world.phys.Vec3D;
 
+import org.bukkit.craftbukkit.event.CraftEventFactory; // CraftBukkit
+
 public abstract class EntityFireball extends IProjectile {
 
     public double dirX;
     public double dirY;
     public double dirZ;
+    public float bukkitYield = 1; // CraftBukkit
+    public boolean isIncendiary = true; // CraftBukkit
 
     protected EntityFireball(EntityTypes<? extends EntityFireball> entitytypes, World world) {
         super(entitytypes, world);
@@ -29,6 +33,12 @@
         this(entitytypes, world);
         this.setPositionRotation(d0, d1, d2, this.yaw, this.pitch);
         this.af();
+        // CraftBukkit start - Added setDirection method
+        this.setDirection(d3, d4, d5);
+    }
+
+    public void setDirection(double d3, double d4, double d5) {
+        // CraftBukkit end
         double d6 = (double) MathHelper.sqrt(d3 * d3 + d4 * d4 + d5 * d5);
 
         if (d6 != 0.0D) {
@@ -63,7 +73,13 @@
             MovingObjectPosition movingobjectposition = ProjectileHelper.a((Entity) this, this::a);
 
             if (movingobjectposition.getType() != MovingObjectPosition.EnumMovingObjectType.MISS) {
-                this.a(movingobjectposition);
+                this.preOnHit(movingobjectposition); // CraftBukkit - projectile hit event
+
+                // CraftBukkit start - Fire ProjectileHitEvent
+                if (this.dead) {
+                    CraftEventFactory.callProjectileHitEvent(this, movingobjectposition);
+                }
+                // CraftBukkit end
             }
 
             this.checkBlockCollisions();
@@ -148,6 +164,11 @@
             Entity entity = damagesource.getEntity();
 
             if (entity != null) {
+                // CraftBukkit start
+                if (CraftEventFactory.handleNonLivingEntityDamageEvent(this, damagesource, f, false)) {
+                    return false;
+                }
+                // CraftBukkit end
                 Vec3D vec3d = entity.getLookDirection();
 
                 this.setMot(vec3d);