diff --git a/patches/server/Add-RegistryAccess-for-managing-Registries.patch b/patches/server/Add-RegistryAccess-for-managing-Registries.patch
index fa876721c6..671decaca1 100644
--- a/patches/server/Add-RegistryAccess-for-managing-Registries.patch
+++ b/patches/server/Add-RegistryAccess-for-managing-Registries.patch
@@ -28,8 +28,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import net.minecraft.core.Registry;
 +import net.minecraft.core.registries.Registries;
 +import net.minecraft.resources.ResourceKey;
-+import net.minecraft.world.item.enchantment.Enchantment;
-+import net.minecraft.world.level.levelgen.structure.Structure;
 +import org.bukkit.GameEvent;
 +import org.bukkit.JukeboxSong;
 +import org.bukkit.Keyed;
@@ -58,11 +56,13 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.craftbukkit.potion.CraftPotionEffectType;
 +import org.bukkit.craftbukkit.util.CraftNamespacedKey;
 +import org.bukkit.damage.DamageType;
++import org.bukkit.enchantments.Enchantment;
 +import org.bukkit.entity.Cat;
 +import org.bukkit.entity.Frog;
 +import org.bukkit.entity.Villager;
 +import org.bukkit.entity.Wolf;
 +import org.bukkit.entity.memory.MemoryKey;
++import org.bukkit.generator.structure.Structure;
 +import org.bukkit.generator.structure.StructureType;
 +import org.bukkit.inventory.ItemType;
 +import org.bukkit.inventory.MenuType;
@@ -422,6 +422,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 @@ -0,0 +0,0 @@
 +package io.papermc.paper.registry.entry;
 +
++import com.google.common.base.Preconditions;
 +import io.papermc.paper.registry.RegistryHolder;
 +import io.papermc.paper.registry.RegistryKey;
 +import java.util.function.BiFunction;
@@ -450,6 +451,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +        final BiFunction<NamespacedKey, M, B> minecraftToBukkit
 +    ) {
 +        super(mcKey, apiKey);
++        Preconditions.checkArgument(!classToPreload.getPackageName().startsWith("net.minecraft"), classToPreload + " should not be in the net.minecraft package as the class-to-preload");
 +        this.classToPreload = classToPreload;
 +        this.minecraftToBukkit = minecraftToBukkit;
 +    }