Paper/nms-patches/ItemFireball.patch

--- a/net/minecraft/server/ItemFireball.java
+++ b/net/minecraft/server/ItemFireball.java
@@ -15,6 +15,14 @@
                 return false;
             } else {
                 if (world.getType(blockposition).getBlock().getMaterial() == Material.AIR) {
+                    // CraftBukkit start - fire BlockIgniteEvent
+                    if (org.bukkit.craftbukkit.event.CraftEventFactory.callBlockIgniteEvent(world, blockposition.getX(), blockposition.getY(), blockposition.getZ(), org.bukkit.event.block.BlockIgniteEvent.IgniteCause.FIREBALL, entityhuman).isCancelled()) {
+                        if (!entityhuman.abilities.canInstantlyBuild) {
+                            --itemstack.count;
+                        }
+                        return false;
+                    }
+                    // CraftBukkit end
                     world.makeSound((double) blockposition.getX() + 0.5D, (double) blockposition.getY() + 0.5D, (double) blockposition.getZ() + 0.5D, "item.fireCharge.use", 1.0F, (ItemFireball.g.nextFloat() - ItemFireball.g.nextFloat()) * 0.2F + 1.0F);
                     world.setTypeUpdate(blockposition, Blocks.FIRE.getBlockData());
                 }