[Bug] GLM 5.3 severe repetition loop / token collapse with "юзер" and leaked Thought Process #819

提交前确认 · Pre-submission checklist

• 我已搜索过现有 issue，确认这不是重复 / I searched existing issues and confirmed this isn't a duplicate.
• 我已阅读 CONTRIBUTING.md / I've read CONTRIBUTING.md.

问题类别 · Category

对话 / Agent 交互 · Agent chat

涉及的 Agent 框架 · Agent framework

ZCode Agent（自研）

严重程度 · Severity

阻塞使用 · Blocking (无法使用核心功能 / core function unusable)

复现频率 · Reproducibility

仅一次 · Once

问题描述 · Description

GLM 5.3 model entered a severe repetition loop with the word "юзер" and leaked its internal "Thought Process" block during a web chat session.

复现步骤 · Steps to reproduce

1. Open chat.z.ai and start a chat session with GLM 5.3.
2. Discuss a topic (in this case, project state and user roles).
3. The model suddenly crashes into a repetition loop.

期望表现 · Expected behavior

The model should give a normal, logical response in Russian without looping or leaking internal technical thoughts.

实际表现 · Actual behavior

The model completely broke down, started an infinite loop repeating the word "юзер" hundreds of times, and leaked its "Thought Process" block.

ZCode 版本 · ZCode version

Web Chat (chat.z.ai) / GLM-5.3

设备 / 系统 / 浏览器 · Device / OS / Browser

Windows 10 / Google Chrome

截图 / 录屏 / 日志 · Screenshots / Recordings / Logs

https://chat.z.ai/s/291b432a-1d64-48e7-bebd-4637f672e46b