[BUG] /pr-comments broken with haiku on bedrock

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?

When I start claude with:

``ANTHROPIC_SMALL_FAST_MODEL=eu.anthropic.claude-3-haiku-20240307-v1:0 claude``

and run /pr-comments

I receive:

> /pr-comments is fetching PR comments… 
  ⎿  API Error: 400 messages.0.content.3.text.cache_control: Extra inputs are not permitted

What Should Happen?

it should fetch the pr comments. using sonnet 4 in the env variable it works. I checked and I do have access to both sonnet and haiku

Error Messages/Logs

Steps to Reproduce

Run: ANTHROPIC_SMALL_FAST_MODEL=eu.anthropic.claude-3-haiku-20240307-v1:0 claude
Call: /pr-comments

Claude Model

Other

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

1.0.128

Platform

AWS Bedrock

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_