[Bug]: Agent输出中断的问题

### Prerequisites

- [x] I have searched the existing [issues](https://github.com/agentscope-ai/agentscope/issues) and [discussions](https://github.com/agentscope-ai/agentscope/discussions), and this is not a duplicate.
- [x] This is a bug, not a usage question. (For questions, please use [Discussions](https://github.com/agentscope-ai/agentscope/discussions/new?category=general) instead.)

### Background / Description

agent对话超过一定的轮次，或者输出超过一定的长度，Agent回复会突然中止，没有任何的提示

### Error Messages

```shell
无
```

### Steps to Reproduce

无

### Environment

- AgentScope Version:2.05
- Python Version:3.11
- OS:Windows