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 xPower;
     public double yPower;
     public double zPower;
+    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.moveTo(d0, d1, d2, this.getYRot(), this.getXRot());
         this.reapplyPosition();
+        // CraftBukkit start - Added setDirection method
+        this.setDirection(d3, d4, d5);
+    }
+
+    public void setDirection(double d3, double d4, double d5) {
+        // CraftBukkit end
         double d6 = Math.sqrt(d3 * d3 + d4 * d4 + d5 * d5);
 
         if (d6 != 0.0D) {
@@ -75,7 +85,13 @@
             MovingObjectPosition movingobjectposition = ProjectileHelper.getHitResult(this, this::canHitEntity);
 
             if (movingobjectposition.getType() != MovingObjectPosition.EnumMovingObjectType.MISS) {
-                this.onHit(movingobjectposition);
+                this.preOnHit(movingobjectposition); // CraftBukkit - projectile hit event
+
+                // CraftBukkit start - Fire ProjectileHitEvent
+                if (this.isRemoved()) {
+                    CraftEventFactory.callProjectileHitEvent(this, movingobjectposition);
+                }
+                // CraftBukkit end
             }
 
             this.checkInsideBlocks();
@@ -161,6 +177,11 @@
 
             if (entity != null) {
                 if (!this.level.isClientSide) {
+                    // CraftBukkit start
+                    if (CraftEventFactory.handleNonLivingEntityDamageEvent(this, damagesource, f, false)) {
+                        return false;
+                    }
+                    // CraftBukkit end
                     Vec3D vec3d = entity.getLookAngle();
 
                     this.setDeltaMovement(vec3d);