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

--- a/net/minecraft/world/ChestLock.java
+++ b/net/minecraft/world/ChestLock.java
@@ -4,6 +4,11 @@
 import net.minecraft.nbt.NBTTagCompound;
 import net.minecraft.world.item.ItemStack;
 
+// CraftBukkit start
+import org.bukkit.ChatColor;
+import org.bukkit.craftbukkit.util.CraftChatMessage;
+// CraftBukkit end
+
 @Immutable
 public class ChestLock {
 
@@ -16,7 +21,19 @@
     }
 
     public boolean a(ItemStack itemstack) {
-        return this.key.isEmpty() || !itemstack.isEmpty() && itemstack.hasName() && this.key.equals(itemstack.getName().getString());
+        // CraftBukkit start - SPIGOT-6307: Check for color codes if the lock contains color codes
+        if (this.key.isEmpty()) return true;
+        if (!itemstack.isEmpty() && itemstack.hasName()) {
+            if (this.key.indexOf(ChatColor.COLOR_CHAR) == -1) {
+                // The lock key contains no color codes, so let's ignore colors in the item display name (vanilla Minecraft behavior):
+                return this.key.equals(itemstack.getName().getString());
+            } else {
+                // The lock key contains color codes, so let's take them into account:
+                return this.key.equals(CraftChatMessage.fromComponent(itemstack.getName()));
+            }
+        }
+        return false;
+        // CraftBukkit end
     }
 
     public void a(NBTTagCompound nbttagcompound) {