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1. Is this request related to a challenge you're experiencing? Tell me about your story.

Why does the Python source code that debugs successfully in VSCode( fail to debug in Dify and display an error?It shows:
Traceback (most recent call last): File "/var/sandbox/sandbox-python/tmp/a67352e1_ea39_4aa9_8edc_185f5af54bd7.py", line 48, in File "", line 30, in File "", line 10, in main TypeError: string indices must be integers error: exit status 255
Codes are bellow：

import json
def main(arg1: str) -> dict:
# Parse the JSON string
data = json.loads(arg1)

# Extract the images dictionary
images = data['data']['images']

# Create Markdown formatted output
result = []
for image_name, image_url in images.items():
    markdown_line = f"[{image_name}]({image_url})"
    result.append(markdown_line)

# Join the Markdown lines with newline characters
markdown_output = "\n".join(result)

return {"result": markdown_output}

2. Additional context or comments

arg1 input："{"code":200,"status":20000,"data":{"images":{"Image 1: 南京市住房保障和房产局":"https://fcj.nanjing.gov.cn/images/njwjj_heared_logo_20171213.jpg\",\"Image 2":"https://fcj.nanjing.gov.cn/images/typic_gabah_bn.png\",\"Image 3: 南京市人民政府":"https://fcj.nanjing.gov.cn/images/zgnj_logo_20170905.png\",\"Image 4":"https://www.nanjing.gov.cn/material/IMAGE/wza-20230529.png\"},\"title\":\"有力监管护民利 暖心服务保平安 ——市交易中心为存量房交易安全保驾护航_政务动态_\t南京市住房保障和房产局","description":"","url":"https://fcj.nanjing.gov.cn/dtxx/zwdt/202504/t20250402_5110281.html\"}}"