Sync fillLimit rule with the equivalent gamerule

src/main/java/carpet/CarpetServer.java

@@ -23,6 +23,8 @@ import carpet.helpers.HopperCounter;
 import carpet.helpers.TickSpeed;
 import carpet.logging.LoggerRegistry;
 import carpet.script.CarpetScriptServer;
+import carpet.api.settings.CarpetRule;
+import carpet.api.settings.InvalidRuleValueException;
 import carpet.api.settings.SettingsManager;
 import carpet.logging.HUDController;
 import carpet.script.external.Carpet;
@@ -104,6 +106,16 @@ public class CarpetServer // static for now - easier to handle all around the co
         extensions.forEach(e -> e.onServerLoadedWorlds(minecraftServer));
         // initialize scarpet rules after all extensions are loaded
         settingsManager.initializeScarpetRules();
+        // run fillLimit rule migration now that gamerules are available
+        @SuppressWarnings("unchecked")
+        CarpetRule<Integer> fillLimit = (CarpetRule<Integer>) settingsManager.getCarpetRule("fillLimit");
+        try
+        {
+            fillLimit.set(minecraftServer.createCommandSourceStack(), fillLimit.value());
+        } catch (InvalidRuleValueException e)
+        {
+            throw new AssertionError();
+        }
         extensions.forEach(e -> {
             if (e.extensionSettingsManager() != null)
             {