Paper/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
@@ -17,11 +17,18 @@
 import net.minecraft.world.phys.MovingObjectPosition;
 import net.minecraft.world.phys.Vec3D;
 
+// CraftBukkit start
+import org.bukkit.craftbukkit.event.CraftEventFactory;
+import org.bukkit.event.entity.EntityRemoveEvent;
+// CraftBukkit end
+
 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);
@@ -36,6 +43,12 @@
         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) {
@@ -76,7 +89,7 @@
         Entity entity = this.getOwner();
 
         if (!this.level().isClientSide && (entity != null && entity.isRemoved() || !this.level().hasChunkAt(this.blockPosition()))) {
-            this.discard();
+            this.discard(EntityRemoveEvent.Cause.DESPAWN); // CraftBukkit - add Bukkit remove cause
         } else {
             super.tick();
             if (this.shouldBurn()) {
@@ -86,7 +99,13 @@
             MovingObjectPosition movingobjectposition = ProjectileHelper.getHitResultOnMoveVector(this, this::canHitEntity, this.getClipType());
 
             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();
@@ -184,6 +203,11 @@
 
             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);