[BUG] In the terminal, when scrolling up through Claude Code's output panel, the same content block often appears duplicated/repeated multiple times.

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?

In the terminal, when scrolling up through Claude Code's output panel, the same content block often appears duplicated/repeated multiple times.

What Should Happen?

In the terminal, when scrolling up through Claude Code's output panel, the same content block often appears duplicated/repeated multiple times.

Error Messages/Logs

Steps to Reproduce

1、In the terminal, when scrolling up through Claude Code's output panel
2、the same content block often appears duplicated/repeated multiple times.

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

opus 4.8

Platform

AWS Bedrock

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_