Paper/paper-server/nms-patches/net/minecraft/world/item/ItemFireball.patch

--- a/net/minecraft/world/item/ItemFireball.java
+++ b/net/minecraft/world/item/ItemFireball.java
@@ -34,12 +34,28 @@
         if (!BlockCampfire.h(iblockdata) && !CandleBlock.g(iblockdata) && !CandleCakeBlock.g(iblockdata)) {
             blockposition = blockposition.shift(itemactioncontext.getClickedFace());
             if (BlockFireAbstract.a(world, blockposition, itemactioncontext.g())) {
+                // 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().getAbilities().instabuild) {
+                        itemactioncontext.getItemStack().subtract(1);
+                    }
+                    return EnumInteractionResult.PASS;
+                }
+                // CraftBukkit end
                 this.a(world, blockposition);
                 world.setTypeUpdate(blockposition, BlockFireAbstract.a((IBlockAccess) world, blockposition));
                 world.a((Entity) itemactioncontext.getEntity(), GameEvent.BLOCK_PLACE, blockposition);
                 flag = true;
             }
         } else {
+            // 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().getAbilities().instabuild) {
+                    itemactioncontext.getItemStack().subtract(1);
+                }
+                return EnumInteractionResult.PASS;
+            }
+            // CraftBukkit end
             this.a(world, blockposition);
             world.setTypeUpdate(blockposition, (IBlockData) iblockdata.set(BlockProperties.LIT, true));
             world.a((Entity) itemactioncontext.getEntity(), GameEvent.BLOCK_PLACE, blockposition);