Fix gamerule

src/main/java/id/dartokloning/lobbysystems/LobbySystemsMod.java

@@ -335,10 +335,25 @@ public final class LobbySystemsMod implements ModInitializer {
         }
 
         List<GameRuleEntry> entries = new ArrayList<>();
+        int skippedRules = 0;
+
         for (GameRule<?> rule : BuiltInRegistries.GAME_RULE) {
-            Identifier id = BuiltInRegistries.GAME_RULE.getKey(rule);
-            if (id == null) continue;
-            entries.add(new GameRuleEntry(id.toString(), gameRuleValue(level, rule)));
+            try {
+                // Minecraft 26.x stores gamerule values directly in GameRules.
+                // Some registered rules may be unavailable for the level's enabled
+                // feature set, so each rule is read independently and safely.
+                if (!rule.isEnabled(level.enabledFeatures())) {
+                    skippedRules++;
+                    continue;
+                }
+
+                Identifier id = rule.getIdentifierWithFallback();
+                entries.add(new GameRuleEntry(id.toString(), gameRuleValue(level, rule)));
+            } catch (RuntimeException e) {
+                skippedRules++;
+                LOGGER.warn("Unable to read gamerule '{}' for dimension '{}'; skipping it.",
+                        safeGameRuleId(rule), level.dimension().identifier(), e);
+            }
         }
         entries.sort(Comparator.comparing(GameRuleEntry::name));
 
@@ -350,7 +365,8 @@ public final class LobbySystemsMod implements ModInitializer {
         sendCommandMessage(source, Component.literal(
                 "§6§lLobby Systems Gamerules §r§7[§f" + page + "§7/§f" + totalPages + "§7]"
                         + "\n§7Dimension: §f" + level.dimension().identifier()
-                        + " §8| §7Rules: §f" + entries.size()));
+                        + " §8| §7Rules: §f" + entries.size()
+                        + (skippedRules > 0 ? " §8| §7Skipped: §e" + skippedRules : "")));
 
         for (int i = start; i < end; i++) {
             GameRuleEntry entry = entries.get(i);
@@ -366,12 +382,19 @@ public final class LobbySystemsMod implements ModInitializer {
         return entries.size();
     }
 
-    @SuppressWarnings({"rawtypes", "unchecked"})
-    private static String gameRuleValue(ServerLevel level, GameRule<?> rule) {
-        Object value = level.getGameRules().get((GameRule) rule);
+    private static <T> String gameRuleValue(ServerLevel level, GameRule<T> rule) {
+        T value = level.getGameRules().get(rule);
         return String.valueOf(value);
     }
 
+    private static String safeGameRuleId(GameRule<?> rule) {
+        try {
+            return rule.getIdentifierWithFallback().toString();
+        } catch (RuntimeException ignored) {
+            return String.valueOf(rule);
+        }
+    }
+
     private static int showDimensionGameMode(CommandSourceStack source, String dimensionId) {
         String mode = DIMENSION_GAMEMODES.get(dimensionId);
         if (mode == null) {

src/main/resources/fabric.mod.json

@@ -5,7 +5,7 @@
   "name": "Lobby Systems",
   "description": "Server-side Fabric lobby routing, persistent world positions, minimum playtime, portals, gamerule inspection, and per-dimension player gamemodes.",
   "authors": ["DartoKloning"],
-  "license": "MIT",
+  "license": "All Rights Reserved",
   "environment": "server",
   "entrypoints": {
     "main": ["id.dartokloning.lobbysystems.LobbySystemsMod"]