Initializing the protected player manager whenever a server is started. This should help prevent any unwanted remnants from another server to be present on other servers.

src/main/java/dev/micle/loginprotection/proxy/Proxy.java

@@ -1,6 +1,7 @@
 package dev.micle.loginprotection.proxy;
 
 import dev.micle.loginprotection.data.ProtectedPlayerManager;
+import dev.micle.loginprotection.network.NetworkManager;
 import dev.micle.loginprotection.setup.Config;
 import dev.micle.loginprotection.setup.Registration;
 import net.minecraft.client.Minecraft;
@@ -26,9 +27,7 @@ public class Proxy implements IProxy {
         // Initialize setup
         Registration.register();
         Config.init();
-
-        // Initialize other
-        ProtectedPlayerManager.init();
+        NetworkManager.init();
 
         // Register mod event bus listeners
         IEventBus modEventBus = FMLJavaModLoadingContext.get().getModEventBus();
@@ -51,6 +50,7 @@ public class Proxy implements IProxy {
     private static void onAddReloadListeners(AddReloadListenerEvent event) {}
 
     private static void serverStarted(ServerStartedEvent event) {
+        ProtectedPlayerManager.init();
         server = event.getServer();
     }