Applications of the agent type couldn't stream return results when xinference was used as the model provider

[liuzhenghua]

Self Checks

• [X] This is only for bug report, if you would like to ask a question, please head to Discussions.
• [X] I have searched for existing issues search for existing issues, including closed ones.
• [X] I confirm that I am using English to submit this report (我已阅读并同意 Language Policy).
• [X] 请务必使用英文提交 Issue，否则会被关闭。谢谢！:）
• [X] Please do not modify this template :) and fill in all the required fields.

Dify version

0.6.11

Cloud or Self Hosted

Self Hosted (Source)

Steps to reproduce

1. Create an application with the type "agent."
2. Set the model to be provided by xinference.
3. Engage in a conversation using the application.

✔️ Expected Behavior

❌ Actual Behavior