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

--- a/net/minecraft/world/ChestLock.java
+++ b/net/minecraft/world/ChestLock.java
@@ -6,6 +6,11 @@
 import net.minecraft.network.chat.IChatBaseComponent;
 import net.minecraft.world.item.ItemStack;
 
+// CraftBukkit start
+import org.bukkit.ChatColor;
+import org.bukkit.craftbukkit.util.CraftChatMessage;
+// CraftBukkit end
+
 public record ChestLock(String key) {
 
     public static final ChestLock NO_LOCK = new ChestLock("");
@@ -18,7 +23,19 @@
         } else {
             IChatBaseComponent ichatbasecomponent = (IChatBaseComponent) itemstack.get(DataComponents.CUSTOM_NAME);
 
-            return ichatbasecomponent != null && this.key.equals(ichatbasecomponent.getString());
+            // CraftBukkit start - SPIGOT-6307: Check for color codes if the lock contains color codes
+            if (this.key.isEmpty()) return true;
+            if (ichatbasecomponent != null) {
+                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(ichatbasecomponent.getString());
+                } else {
+                    // The lock key contains color codes, so let's take them into account:
+                    return this.key.equals(CraftChatMessage.fromComponent(ichatbasecomponent));
+                }
+            }
+            return false;
+            // CraftBukkit end
         }
     }