[BUG] Sometimes missing result in --output-format stream-json

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 using --output-format stream-json, the final message with subtype: success returns an empty result field instead of containing the actual response content/output.

What Should Happen?

Result shouldn't be empty.

Error Messages/Logs

Steps to Reproduce

Not sure, happens randomly with the following arguments:
-p
--verbose
--mcp-config [mcpFile]
--output-format stream-json
--max-turns 100

Claude Model

Sonnet (default)

Is this a regression?

I don't know. But maybe, because when I started with claude code like 1.0.20? It never happened, and it seems it's getting worse over time

Last Working Version

_No response_

Claude Code Version

1.0.123

Platform

Google Vertex AI

Operating System

Other Linux

Terminal/Shell

Non-interactive/CI environment

Additional Information

Also sometimes happens, that final result_sucesss message is missing.
In previous messages I can see "type: message" that contains response that I would expect