[Bug] Claude switches to Chinese output despite English-only conversation context

Related Claude Code issues

Matched on shared title terms, labels, topic and reported release — ranked so issues with real discussion come first.

• [BUG] Conversation titles always in English even when user messages are in Chinese
  Resolved 💬 3 #39064
• [BUG] Claude randomly switches to Korean when responding in a Chinese conversation
  Open 💬 0 v2.1.181 #82752
• [BUG] Claude spontaneously switches to Korean mid-conversation when using Chinese
  Resolved 💬 3 v2.1.63 #30025
• [Bug] Chinese characters appearing in API responses instead of English text
  Open 💬 0 v2.1.220 #83324
• with chinese
  Resolved 💬 1 #67921
• Status bar shows Chinese text "致性检查" instead of English
  Open 💬 0 #89024
• [Bug] Mixed language characters in Claude response (Chinese character in English text)
  Open 💬 2 v2.1.214 #80053
• [Bug] Model unexpectedly switches to Opus without user request
  Resolved 💬 0 v2.1.220 #81996

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Same class of failure, ranked by community engagement — this issue is one of many, so it may not appear in the visible list: IDE & terminal integration

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