Version 2.0.73: Text rendering bug - lines dropped and garbled output

Description

Version 2.0.73 has a severe text rendering bug where assistant text output is garbled:

• Lines are randomly dropped (consistently the 4th line in test messages)
• Left side of text is cut off
• Large gaps appear where text should be

Tool output renders correctly - only the assistant's direct text responses are affected.

Environment

• OS: Windows 11 (10.0.26200)
• Terminal: Windows Terminal and cmd.exe (both affected)
• Node: v22.x
• Claude Code Version: 2.0.73

Steps to Reproduce

1. Install claude-code 2.0.73
2. Start a session
3. Observe that assistant text responses are garbled/incomplete

Expected Behavior

All text should render completely and correctly.

Actual Behavior

Text is garbled with:

• Missing lines (4th line consistently dropped in tests)
• Left portions of lines cut off
• Irregular spacing

Workaround

Rolling back to version 2.0.72 resolves the issue:

npm uninstall -g @anthropic-ai/claude-code
npm install -g @anthropic-ai/claude-code@2.0.72

Additional Context

• Issue persists across terminal restarts and machine reboots
• Issue persists in both Windows Terminal and cmd.exe
• Disabling Norton antivirus did not resolve the issue
• Fresh sessions (not resumed) also exhibit the bug
• Only affects 2.0.73; 2.0.72 works correctly