[BUG] each tool_use must have a single result. Found multiple `tool_result` blocks

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?

<img width="1118" height="942" alt="Image" src="https://github.com/user-attachments/assets/cd3522ba-f730-4586-a187-06410b571672" />

What Should Happen?

Run without error, IDK how the issue happend therefore I don't have a clear idea how it works in normal.

Error Messages/Logs

API Error: 400 {"error":{"message":"litellm.BadRequestError: OpenAIException - litellm.BadRequestError: Vertex_aiException BadRequestError - 
    {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.10.content.1: each tool_use must have a single result. Found 
    multiple `tool_result` blocks with id: toolu_vrtx_01WjbYafn5hwELEqiDQ4n2wv\"},\"request_id\":\"req_vrtx_011CW9avnHYBK1RUB8buj7oH\"}. Received Model 
    Group=claude-4.5-haiku\nAvailable Model Group Fallbacks=None. Received Model Group=openai/claude-4.5-haiku\nAvailable Model Group 
    Fallbacks=None","type":null,"param":null,"code":"400"}}

Steps to Reproduce

1. claude
2. Ask some questions which would lead claude trying to do with tools

Claude Model

Not sure / Multiple models

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.0.70 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_