fix: 各种坐下指令的bug

src/main/java/com/github/zly2006/carpetslsaddition/ServerMain.java

@@ -130,9 +130,14 @@ public class ServerMain implements ModInitializer, CarpetExtension {
                 .executes(context -> {
                     ServerPlayerEntity player = context.getSource().getPlayer();
                     assert player != null;
+
+                    if (player.getVehicle() != null) {  // 防止重复的坐下行为
+                        return 1;
+                    }
+
                     World world = player.getWorld();
 
-                    ArmorStandEntity armorStandEntity = new ArmorStandEntity(world, player.getX(), player.getY() - 0.16, player.getZ());
+                    ArmorStandEntity armorStandEntity = new ArmorStandEntity(world, player.getX(), player.getY(), player.getZ());
                     ((SitEntity) armorStandEntity).setSitEntity(true);
                     world.spawnEntity(armorStandEntity);
                     player.setSneaking(false);

src/main/java/com/github/zly2006/carpetslsaddition/mixin/entity/MixinPlayerEntity.java

@@ -7,6 +7,7 @@ import net.minecraft.entity.EquipmentSlot;
 import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.item.ItemStack;
 import net.minecraft.nbt.NbtCompound;
+import net.minecraft.stat.Stat;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.Shadow;
 import org.spongepowered.asm.mixin.injection.At;
@@ -19,6 +20,8 @@ import static com.github.zly2006.carpetslsaddition.ServerMain.*;
 public abstract class MixinPlayerEntity implements PlayerAccess {
     @Shadow public abstract ItemStack getEquippedStack(EquipmentSlot slot);
 
+    @Shadow public abstract void resetStat(Stat<?> stat);
+
     @Override
     public boolean holdingObsidianPickaxe() {
         ItemStack itemStack = getEquippedStack(EquipmentSlot.MAINHAND);