Backported successfully!

build.gradle

@@ -5,7 +5,7 @@ plugins {
 }
 
 group = 'me.trouper'
-version = '1.0-SNAPSHOT'
+version = '1.0-1.21.1-SNAPSHOT'
 
 repositories {
     mavenCentral()
@@ -20,7 +20,7 @@ repositories {
 }
 
 dependencies {
-    compileOnly("io.papermc.paper:paper-api:1.21.5-R0.1-SNAPSHOT")
+    compileOnly("io.papermc.paper:paper-api:1.21.1-R0.1-SNAPSHOT")
 }
 
 tasks {

src/main/java/me/trouper/alias/data/JsonSerializable.java

@@ -7,13 +7,13 @@ import java.io.*;
 
 public interface JsonSerializable<T> {
 
-    Gson gson = new GsonBuilder().setPrettyPrinting().serializeNulls().setStrictness(Strictness.LENIENT).create();
+    Gson gson = new GsonBuilder().setPrettyPrinting().serializeNulls().setLenient().create();
     File getFile();
 
     default String serialize(boolean pretty) {
         Gson gson;
         if (pretty) {
-            gson = new GsonBuilder().setPrettyPrinting().setStrictness(Strictness.LENIENT).create();
+            gson = new GsonBuilder().setPrettyPrinting().setLenient().create();
         }
         else {
             gson = new Gson();

src/main/java/me/trouper/alias/server/systems/TaskManager.java

@@ -16,9 +16,8 @@ public class TaskManager implements Main {
         if (closed) return -1;
 
         int taskId = Bukkit.getScheduler().runTaskLater(main.getPlugin(), () -> {
-            if (!closed && tasks.containsKey(taskId)) {
+            if (!closed) {
                 task.run();
-                tasks.remove(taskId);
             }
         }, delay).getTaskId();
 

src/main/java/me/trouper/alias/server/systems/Text.java

@@ -442,7 +442,7 @@ public class Text implements Main {
                 TextColor.color(0xFFB0C1),  // Light pink for default args
                 TextColor.color(0xB6F5B6),  // Light green for second arg
                 TextColor.color(0xB0C1FF),  // Light blue for third arg
-                new SoundData(Sound.UI_HUD_BUBBLE_POP, 2)
+                new SoundData(Sound.UI_TOAST_IN, 2)
         );
 
         private final TextColor mainText;

src/main/java/me/trouper/alias/utils/ItemBuilder.java

@@ -10,7 +10,6 @@ import org.bukkit.enchantments.Enchantment;
 import org.bukkit.inventory.ItemFlag;
 import org.bukkit.inventory.ItemStack;
 import org.bukkit.inventory.meta.ItemMeta;
-import org.bukkit.inventory.meta.components.CustomModelDataComponent;
 
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -20,7 +19,6 @@ import java.util.function.Function;
 public class ItemBuilder {
     private ItemStack stack;
     private ItemMeta meta;
-    private CustomModelDataComponent modelData;
     private final MiniMessage miniMessage = MiniMessage.miniMessage();
 
     public ItemBuilder() {
@@ -186,16 +184,6 @@ public class ItemBuilder {
         return unbreakable(true);
     }
 
-    public ItemBuilder customModelData(CustomModelDataComponent data) {
-        this.modelData = data;
-        return this;
-    }
-
-    public ItemBuilder clearCustomModelData() {
-        this.modelData = null;
-        return this;
-    }
-
     public ItemBuilder modifyStack(Function<ItemStack, ItemStack> modifier) {
         this.stack = modifier.apply(this.build());
         this.meta = this.stack.getItemMeta();
@@ -215,7 +203,6 @@ public class ItemBuilder {
     }
 
     public ItemStack build() {
-        this.meta.setCustomModelDataComponent(this.modelData);
         this.stack.setItemMeta(this.meta);
         return this.stack.clone();
     }