Messages disappear from terminal display on Windows 11 + VSCode after v2.1.89 update

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

After updating to v2.1.89, earlier messages (both user prompts and Claude responses) disappear from the terminal display during conversations. This is a display/rendering issue only — Claude still has the conversation internally (/context confirms low usage), but earlier messages are completely gone from terminal output. Scrolling up does not recover them.

This is the same issue as #41814, adding a Windows-specific environment report.

What Should Happen?

Previous messages should remain visible in terminal scrollback throughout the conversation, as they did in v2.1.87 and earlier versions.

Error Messages/Logs

No error messages. Silent display issue — messages simply vanish from terminal.
/context shows ~6-10% usage when it happens, confirming this is NOT autocompact.

Steps to Reproduce

1. Start a Claude Code session on v2.1.89
2. Have a conversation involving tool usage (file reads, code exploration, edits)
3. After several exchanges with tool-heavy responses, notice earlier messages are no longer visible
4. Scroll up — messages are completely gone from terminal output
5. Run /context — confirms low context usage (not autocompact)

What has been ruled out

• Not autocompact — /context shows low usage (~6-10%)
• Not CLAUDE_CODE_NO_FLICKER — tested with CLAUDE_CODE_NO_FLICKER=1 enabled, same behavior
• Not terminal scrollback limit — issue persists regardless of scrollback settings

Claude Model

Opus 4.6 (1M context)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.1.87

Claude Code Version

2.1.89

Platform

Anthropic API (Claude Max)

Operating System

Windows 11 Home 10.0.26200

Terminal/Shell

VSCode integrated terminal (Git Bash)

Additional Information

• Shell: Git Bash (MINGW64)
• CLAUDE_CODE_NO_FLICKER=1 is set — does not fix the issue
• Related: #41814, #41825, #40497
• This regression started immediately after updating from v2.1.87 to v2.1.89

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