PaperMC/paper-server/patches/sources/net/minecraft/world/item/EggItem.java.patch

--- a/net/minecraft/world/item/EggItem.java
+++ b/net/minecraft/world/item/EggItem.java
@@ -23,6 +_,28 @@
     @Override
     public InteractionResult use(Level level, Player player, InteractionHand hand) {
         ItemStack itemInHand = player.getItemInHand(hand);
+        if (level instanceof ServerLevel serverLevel) {
+            // CraftBukkit start
+            // Paper start - PlayerLaunchProjectileEvent
+            final Projectile.Delayed<ThrownEgg> thrownEgg = Projectile.spawnProjectileFromRotationDelayed(ThrownEgg::new, serverLevel, itemInHand, player, 0.0F, EggItem.PROJECTILE_SHOOT_POWER, 1.0F);
+            com.destroystokyo.paper.event.player.PlayerLaunchProjectileEvent event = new com.destroystokyo.paper.event.player.PlayerLaunchProjectileEvent((org.bukkit.entity.Player) player.getBukkitEntity(), org.bukkit.craftbukkit.inventory.CraftItemStack.asCraftMirror(itemstack), (org.bukkit.entity.Projectile) thrownEgg.projectile().getBukkitEntity());
+            if (event.callEvent() && thrownEgg.attemptSpawn()) {
+                if (event.shouldConsume()) {
+                    itemInHand.consume(1, player);
+                } else if (player instanceof net.minecraft.server.level.ServerPlayer) {
+                    ((net.minecraft.server.level.ServerPlayer) player).getBukkitEntity().updateInventory();
+                }
+                level.playSound(null, player.getX(), player.getY(), player.getZ(), SoundEvents.EGG_THROW, SoundSource.PLAYERS, 0.5F, 0.4F / (level.getRandom().nextFloat() * 0.4F + 0.8F));
+                player.awardStat(Stats.ITEM_USED.get(this));
+            } else {
+                // Paper end - PlayerLaunchProjectileEvent
+                if (player instanceof net.minecraft.server.level.ServerPlayer) {
+                    ((net.minecraft.server.level.ServerPlayer) player).getBukkitEntity().updateInventory();
+                }
+                return InteractionResult.FAIL;
+            }
+            // CraftBukkit end
+        }
         level.playSound(
             null,
             player.getX(),
@@ -33,12 +_,7 @@
             0.5F,
             0.4F / (level.getRandom().nextFloat() * 0.4F + 0.8F)
         );
-        if (level instanceof ServerLevel serverLevel) {
-            Projectile.spawnProjectileFromRotation(ThrownEgg::new, serverLevel, itemInHand, player, 0.0F, PROJECTILE_SHOOT_POWER, 1.0F);
-        }
-
-        player.awardStat(Stats.ITEM_USED.get(this));
-        itemInHand.consume(1, player);
+        // Paper - PlayerLaunchProjectileEvent - moved up
         return InteractionResult.SUCCESS;
     }