From 4a16fa2297065e579627995a923ca6bad9ee4a93 Mon Sep 17 00:00:00 2001
From: Ben Woo <30431861+benwoo1110@users.noreply.github.com>
Date: Wed, 8 Apr 2026 14:20:01 +0800
Subject: [PATCH] Fix world folder being lowercased due to namespace changes in
 26.1

---
 .../multiverse/core/world/helpers/WorldNameChecker.java       | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/main/java/org/mvplugins/multiverse/core/world/helpers/WorldNameChecker.java b/src/main/java/org/mvplugins/multiverse/core/world/helpers/WorldNameChecker.java
index 6554a856d..bea5c61b1 100644
--- a/src/main/java/org/mvplugins/multiverse/core/world/helpers/WorldNameChecker.java
+++ b/src/main/java/org/mvplugins/multiverse/core/world/helpers/WorldNameChecker.java
@@ -120,14 +120,16 @@ public FolderStatus checkFolder(@Nullable String worldName) {
         if (worldName == null) {
             return FolderStatus.DOES_NOT_EXIST;
         }
-        File worldFolder = BukkitCompatibility.getWorldFoldersDirectory().resolve(worldName).toFile();
+
         if (BukkitCompatibility.isUsingNewDimensionStorage()) {
             File oldWorldFolder = Bukkit.getWorldContainer().toPath().resolve(worldName).toFile();
             if (checkFolder(oldWorldFolder) == FolderStatus.VALID) {
                 return FolderStatus.REQUIRES_MIGRATION;
             }
+            worldName = worldName.toLowerCase(Locale.ENGLISH); // namespace is case-insensitive and stored as lowercase
         }
 
+        File worldFolder = BukkitCompatibility.getWorldFoldersDirectory().resolve(worldName).toFile();
         return checkFolder(worldFolder);
     }