Truncated/corrupted output in Claude Code v2.0.73

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?

Bug Report: Truncated/corrupted output in Claude Code v2.0.73

Environment

• Claude Code version: 2.0.73 (latest)
• Model: Opus 4.5
• OS: Windows
• IDEs tested: IntelliJ IDEA, Visual Studio Code
• Issue occurs in both integrated terminals

Description

Claude Code produces truncated, corrupted, and poorly formatted responses. The output contains:

1. Truncated text: Words cut in half (e.g., "ratto al POST" instead of "Contratto al POST")
2. Large empty spaces: Multiple blank lines appearing in the middle of responses
3. Broken table formatting: Markdown tables rendered with only | and - characters, missing content
4. Incomplete analysis: When asked for detailed implementation plans, Claude provides vague summaries instead of specifying exact files and code changes

Steps to Reproduce

1. Open Claude Code in a project directory
2. Ask for a detailed analysis with implementation plan, e.g.:

> "Analyze this endpoint and tell me in detail how you intend to implement the changes, listing all files to modify"

1. Observe the response

Expected Behavior

• Complete, readable responses
• Detailed analysis listing specific files and code changes
• Properly formatted markdown tables and code blocks

Actual Behavior

Response example (from terminal output):

|
----------------------------------------------------|
ratto al POST, rimuovere PUT                        |
icaContratto per gestire anche i dati del contratto |
do caricaContratto con i nuovi parametri            |

Instead of a complete sentence like:

| File | Modification |
|------|--------------|
| procurement.yaml | Add contract fields to POST, remove PUT |
| ContrattoService.java | Update caricaContratto to handle contract data |
| GestioneRichiesteController.java | Update caricaContratto with new parameters |

Additional Context

• The issue is consistent across different terminals/IDEs
• Happens with complex requests requiring detailed responses
• Started recently (user reports this was working better before)

Workaround Attempted

• Changing terminal (PowerShell, cmd, Git Bash): no improvement
• Resizing terminal window: no improvement
• Both IntelliJ and VS Code show the same issue

What Should Happen?

n

Error Messages/Logs

Steps to Reproduce

n

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.0.73

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

IntelliJ IDEA terminal

Additional Information

_No response_