Paper/nms-patches/ItemFireball.patch

--- a/net/minecraft/server/ItemFireball.java
+++ b/net/minecraft/server/ItemFireball.java
@@ -14,12 +14,28 @@
         boolean flag = false;
 
         if (BlockCampfire.h(iblockdata)) {
+            // CraftBukkit start - fire BlockIgniteEvent
+            if (org.bukkit.craftbukkit.event.CraftEventFactory.callBlockIgniteEvent(world, blockposition, org.bukkit.event.block.BlockIgniteEvent.IgniteCause.FIREBALL, itemactioncontext.getEntity()).isCancelled()) {
+                if (!itemactioncontext.getEntity().abilities.canInstantlyBuild) {
+                    itemactioncontext.getItemStack().subtract(1);
+                }
+                return EnumInteractionResult.PASS;
+            }
+            // CraftBukkit end
             this.a(world, blockposition);
             world.setTypeUpdate(blockposition, (IBlockData) iblockdata.set(BlockCampfire.b, true));
             flag = true;
         } else {
             blockposition = blockposition.shift(itemactioncontext.getClickedFace());
             if (BlockFireAbstract.a(world, blockposition, itemactioncontext.f())) {
+                // CraftBukkit start - fire BlockIgniteEvent
+                if (org.bukkit.craftbukkit.event.CraftEventFactory.callBlockIgniteEvent(world, blockposition, org.bukkit.event.block.BlockIgniteEvent.IgniteCause.FIREBALL, itemactioncontext.getEntity()).isCancelled()) {
+                    if (!itemactioncontext.getEntity().abilities.canInstantlyBuild) {
+                        itemactioncontext.getItemStack().subtract(1);
+                    }
+                    return EnumInteractionResult.PASS;
+                }
+                // CraftBukkit end
                 this.a(world, blockposition);
                 world.setTypeUpdate(blockposition, BlockFireAbstract.a((IBlockAccess) world, blockposition));
                 flag = true;