SpigotCore_19/src/de/steamwar/core/ProtocolWrapper19.java

@@ -22,6 +22,7 @@ package de.steamwar.core;
 import com.comphenix.tinyprotocol.Reflection;
 import com.mojang.authlib.GameProfile;
 import com.mojang.datafixers.util.Pair;
+import net.minecraft.SystemUtils;
 import net.minecraft.network.protocol.game.ClientboundPlayerInfoRemovePacket;
 import net.minecraft.network.protocol.game.ClientboundPlayerInfoUpdatePacket;
 import net.minecraft.world.level.EnumGamemode;
@@ -30,6 +31,7 @@ import org.bukkit.GameMode;
 import java.util.Collections;
 import java.util.EnumSet;
 import java.util.List;
+import java.util.function.LongSupplier;
 
 public class ProtocolWrapper19 implements ProtocolWrapper {
 
@@ -54,4 +56,9 @@ public class ProtocolWrapper19 implements ProtocolWrapper {
         updatePlayers.set(packet, Collections.singletonList(new ClientboundPlayerInfoUpdatePacket.b(profile.getId(), profile, false, 0, EnumGamemode.a(mode.getValue()), null, null)));
         return packet;
     }
+
+    @Override
+    public void initTPSWarp(LongSupplier longSupplier) {
+        SystemUtils.a = () -> System.nanoTime() + longSupplier.getAsLong();
+    }
 }

SpigotCore_Main/src/de/steamwar/core/ProtocolWrapper.java

@@ -23,6 +23,8 @@ import com.comphenix.tinyprotocol.Reflection;
 import com.mojang.authlib.GameProfile;
 import org.bukkit.GameMode;
 
+import java.util.function.LongSupplier;
+
 public interface ProtocolWrapper {
 
     Class<?> itemStack = Reflection.getClass("{nms.world.item}.ItemStack");
@@ -42,6 +44,9 @@ public interface ProtocolWrapper {
 
     Object playerInfoPacketConstructor(PlayerInfoAction action, GameProfile profile, GameMode mode);
 
+    default void initTPSWarp(LongSupplier longSupplier) {
+    }
+
     enum PlayerInfoAction {
         ADD,
         GAMEMODE,

SpigotCore_Main/src/de/steamwar/core/TPSWarpUtils.java

@@ -35,9 +35,13 @@ public class TPSWarpUtils {
     private static BukkitTask bukkitTask = null;
 
     static {
-        Class clazz = Reflection.getClass(Core.getVersion() <= 15 ? "{nms}.SystemUtils" : "net.minecraft.SystemUtils");
-        Reflection.FieldAccessor<LongSupplier> fieldAccessor = Reflection.getField(clazz, LongSupplier.class, 0);
-        fieldAccessor.set(clazz, (LongSupplier) () -> System.nanoTime() + nanoDOffset);
+        if (Core.getVersion() <= 18) {
+            Class clazz = Reflection.getClass("{nms}.SystemUtils");
+            Reflection.FieldAccessor fieldAccessor = Reflection.getField(clazz, LongSupplier.class, 0);
+            fieldAccessor.set(clazz, (LongSupplier) () -> System.nanoTime() + nanoDOffset);
+        } else {
+            ProtocolWrapper.impl.initTPSWarp(() -> nanoDOffset);
+        }
     }
 
     public static void warp(double tps) {