PaperMC/paper-server/nms-patches/net/minecraft/world/item/ItemEgg.patch

--- a/net/minecraft/world/item/ItemEgg.java
+++ b/net/minecraft/world/item/ItemEgg.java
@@ -19,14 +19,22 @@
     public InteractionResultWrapper<ItemStack> a(World world, EntityHuman entityhuman, EnumHand enumhand) {
         ItemStack itemstack = entityhuman.b(enumhand);
 
-        world.playSound((EntityHuman) null, entityhuman.locX(), entityhuman.locY(), entityhuman.locZ(), SoundEffects.EGG_THROW, SoundCategory.PLAYERS, 0.5F, 0.4F / (world.getRandom().nextFloat() * 0.4F + 0.8F));
+        // world.playSound((EntityHuman) null, entityhuman.locX(), entityhuman.locY(), entityhuman.locZ(), SoundEffects.EGG_THROW, SoundCategory.PLAYERS, 0.5F, 0.4F / (world.getRandom().nextFloat() * 0.4F + 0.8F)); // CraftBukkit - moved down
         if (!world.isClientSide) {
             EntityEgg entityegg = new EntityEgg(world, entityhuman);
 
             entityegg.setItem(itemstack);
             entityegg.a(entityhuman, entityhuman.getXRot(), entityhuman.getYRot(), 0.0F, 1.5F, 1.0F);
-            world.addEntity(entityegg);
+            // CraftBukkit start
+            if (!world.addEntity(entityegg)) {
+                if (entityhuman instanceof net.minecraft.server.level.EntityPlayer) {
+                    ((net.minecraft.server.level.EntityPlayer) entityhuman).getBukkitEntity().updateInventory();
+                }
+                return InteractionResultWrapper.fail(itemstack);
+            }
+            // CraftBukkit end
         }
+        world.playSound((EntityHuman) null, entityhuman.locX(), entityhuman.locY(), entityhuman.locZ(), SoundEffects.EGG_THROW, SoundCategory.PLAYERS, 0.5F, 0.4F / (world.getRandom().nextFloat() * 0.4F + 0.8F));
 
         entityhuman.b(StatisticList.ITEM_USED.b(this));
         if (!entityhuman.getAbilities().instabuild) {