craftbukkit/nms-patches/net/minecraft/world/item/ItemSnowball.patch

--- a/net/minecraft/world/item/ItemSnowball.java
+++ b/net/minecraft/world/item/ItemSnowball.java
@@ -23,13 +23,21 @@
     public EnumInteractionResult use(World world, EntityHuman entityhuman, EnumHand enumhand) {
         ItemStack itemstack = entityhuman.getItemInHand(enumhand);
 
-        world.playSound((EntityHuman) null, entityhuman.getX(), entityhuman.getY(), entityhuman.getZ(), SoundEffects.SNOWBALL_THROW, SoundCategory.NEUTRAL, 0.5F, 0.4F / (world.getRandom().nextFloat() * 0.4F + 0.8F));
+        // CraftBukkit start - moved down
+        // world.playSound((EntityHuman) null, entityhuman.getX(), entityhuman.getY(), entityhuman.getZ(), SoundEffects.SNOWBALL_THROW, SoundCategory.NEUTRAL, 0.5F, 0.4F / (world.getRandom().nextFloat() * 0.4F + 0.8F));
         if (world instanceof WorldServer worldserver) {
-            IProjectile.spawnProjectileFromRotation(EntitySnowball::new, worldserver, itemstack, entityhuman, 0.0F, 1.5F, 1.0F);
+            if (IProjectile.spawnProjectileFromRotation(EntitySnowball::new, worldserver, itemstack, entityhuman, 0.0F, 1.5F, 1.0F).isAlive()) {
+                itemstack.consume(1, entityhuman);
+
+                world.playSound((EntityHuman) null, entityhuman.getX(), entityhuman.getY(), entityhuman.getZ(), SoundEffects.SNOWBALL_THROW, SoundCategory.NEUTRAL, 0.5F, 0.4F / (world.getRandom().nextFloat() * 0.4F + 0.8F));
+            } else if (entityhuman instanceof net.minecraft.server.level.EntityPlayer) {
+                ((net.minecraft.server.level.EntityPlayer) entityhuman).getBukkitEntity().updateInventory();
+            }
+            // CraftBukkit end
         }
 
         entityhuman.awardStat(StatisticList.ITEM_USED.get(this));
-        itemstack.consume(1, entityhuman);
+        // itemstack.consume(1, entityhuman); // CraftBukkit - moved up
         return EnumInteractionResult.SUCCESS;
     }