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
@@ -18,11 +18,17 @@
 import net.minecraft.world.phys.MovingObjectPosition;
 import net.minecraft.world.phys.Vec3D;
 
+// CraftBukkit start
+import org.bukkit.event.entity.EntityRemoveEvent;
+// CraftBukkit end
+
 public abstract class EntityFireball extends IProjectile {
 
     public static final double INITAL_ACCELERATION_POWER = 0.1D;
     public static final double DEFLECTION_SCALE = 0.5D;
     public double accelerationPower;
+    public float bukkitYield = 1; // CraftBukkit
+    public boolean isIncendiary = true; // CraftBukkit
 
     protected EntityFireball(EntityTypes<? extends EntityFireball> entitytypes, World world) {
         super(entitytypes, world);
@@ -71,7 +77,7 @@
         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()) {
@@ -81,7 +87,7 @@
             MovingObjectPosition movingobjectposition = ProjectileHelper.getHitResultOnMoveVector(this, this::canHitEntity, this.getClipType());
 
             if (movingobjectposition.getType() != MovingObjectPosition.EnumMovingObjectType.MISS) {
-                this.hitTargetOrDeflectSelf(movingobjectposition);
+                this.preHitTargetOrDeflectSelf(movingobjectposition); // CraftBukkit - projectile hit event
             }
 
             this.checkInsideBlocks();