the ply result of demo_multi_object has no color

the ply result of demo_multi_object has no color:
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code is:
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import os
import uuid
import imageio
import numpy as np
from IPython.display import Image as ImageDisplay

import sys
sys.path.append("notebook")
from inference import Inference, ready_gaussian_for_video_rendering, load_image, load_masks, display_image, make_scene, render_video, interactive_visualizer

# PATH = os.getcwd()
TAG = "hf"

config_path = "/workspace/sam-3d-objects/checkpoints/pipeline.yaml"
inference = Inference(config_path, compile=False)

IMAGE_PATH = "/workspace/sam-3d-objects/notebook/images/shutterstock_stylish_kidsroom_1640806567/image.png"
IMAGE_NAME = os.path.basename(os.path.dirname(IMAGE_PATH))

image = load_image(IMAGE_PATH)
masks = load_masks(os.path.dirname(IMAGE_PATH), extension=".png")

outputs = [inference(image, mask, seed=42) for mask in masks]

scene_gs = make_scene(*outputs)
scene_gs.save_ply("merged_posed.ply")
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result is: