place the player before loading the data

src/main/java/carpet/patches/EntityPlayerMPFake.java

@@ -2,11 +2,8 @@ package carpet.patches;
 
 import carpet.CarpetSettings;
 import com.mojang.authlib.GameProfile;
-import com.mojang.authlib.properties.PropertyMap;
 import net.minecraft.core.BlockPos;
 import net.minecraft.core.UUIDUtil;
-import net.minecraft.core.component.DataComponents;
-import net.minecraft.nbt.CompoundTag;
 import net.minecraft.network.DisconnectionDetails;
 import net.minecraft.network.chat.Component;
 import net.minecraft.network.chat.contents.TranslatableContents;
@@ -22,8 +19,6 @@ import net.minecraft.server.level.ClientInformation;
 import net.minecraft.server.level.ServerLevel;
 import net.minecraft.server.level.ServerPlayer;
 import net.minecraft.server.network.CommonListenerCookie;
-import net.minecraft.server.players.CachedUserNameToIdResolver;
-import net.minecraft.server.players.NameAndId;
 import net.minecraft.server.players.OldUsersConverter;
 import net.minecraft.util.ProblemReporter;
 import net.minecraft.world.damagesource.DamageSource;
@@ -36,7 +31,6 @@ import net.minecraft.world.item.ItemStack;
 import net.minecraft.world.item.component.ResolvableProfile;
 import net.minecraft.world.level.GameType;
 import net.minecraft.world.level.Level;
-import net.minecraft.world.level.block.entity.SkullBlockEntity;
 import net.minecraft.world.level.block.state.BlockState;
 import net.minecraft.world.level.portal.TeleportTransition;
 import net.minecraft.world.level.storage.TagValueInput;
@@ -104,9 +98,10 @@ public class EntityPlayerMPFake extends ServerPlayer
             }
 
             EntityPlayerMPFake instance = new EntityPlayerMPFake(server, worldIn, current, ClientInformation.createDefault(), false);
-            loadPlayerData(instance);
             instance.fixStartingPosition = () -> instance.snapTo(pos.x, pos.y, pos.z, (float) yaw, (float) pitch);
             server.getPlayerList().placeNewPlayer(new FakeClientConnection(PacketFlow.SERVERBOUND), instance, new CommonListenerCookie(current, 0, instance.clientInformation(), false));
+            loadPlayerData(instance);
+            instance.stopRiding(); // otherwise the created fake player will be on the vehicle
             instance.teleportTo(worldIn, pos.x, pos.y, pos.z, Set.of(), (float) yaw, (float) pitch, true);
             instance.setHealth(20.0F);
             instance.unsetRemoved();
@@ -132,7 +127,7 @@ public class EntityPlayerMPFake extends ServerPlayer
         {
             Optional<ValueInput> optional = player.level().getServer().getPlayerList().loadPlayerData(player.nameAndId()).map((compoundTag) -> TagValueInput.create(scopedCollector, player.registryAccess(), compoundTag));
             optional.ifPresent( valueInput -> {
-                player.readAdditionalSaveData(valueInput);
+                player.load(valueInput);
                 player.loadAndSpawnEnderPearls(valueInput);
                 player.loadAndSpawnParentVehicle(valueInput);
             });
@@ -147,8 +142,8 @@ public class EntityPlayerMPFake extends ServerPlayer
         GameProfile gameprofile = player.getGameProfile();
         EntityPlayerMPFake playerShadow = new EntityPlayerMPFake(server, worldIn, gameprofile, player.clientInformation(), true);
         playerShadow.setChatSession(player.getChatSession());
-        loadPlayerData(playerShadow);
         server.getPlayerList().placeNewPlayer(new FakeClientConnection(PacketFlow.SERVERBOUND), playerShadow, new CommonListenerCookie(gameprofile, 0, player.clientInformation(), true));
+        loadPlayerData(playerShadow);
 
         playerShadow.setHealth(player.getHealth());
         playerShadow.connection.teleport(player.getX(), player.getY(), player.getZ(), player.getYRot(), player.getXRot());
@@ -179,7 +174,7 @@ public class EntityPlayerMPFake extends ServerPlayer
     private EntityPlayerMPFake(MinecraftServer server, ServerLevel worldIn, GameProfile profile, ClientInformation cli, boolean shadow)
     {
         super(server, worldIn, profile, cli);
-        isAShadow = shadow;
+        this.isAShadow = shadow;
     }
 
     @Override