[BUG] Issues are labeled as duplicates without referencing the original issue

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?

Issues are labeled by github-actions bot as duplicates without referencing the original issue.

See an example of the issue https://github.com/anthropics/claude-code/issues/79240 that is labeled as duplicate without a comment explaining what is the original issue this issue os the duplicate of.

<img width="1423" height="640" alt="Image" src="https://github.com/user-attachments/assets/17df9f75-2603-4653-9042-c6cd9bb5cc37" />

Compare the above the issue https://github.com/anthropics/claude-code/issues/78415, which contains the comment listing the original issues.

<img width="1423" height="679" alt="Image" src="https://github.com/user-attachments/assets/d3e0b8d1-1f40-4fd6-ae78-d3d0a8ee3e32" />

What Should Happen?

If an issue is labeled as duplicate, a comment should be posted that includes information which are the original issues the issue is a duplicate of.

Error Messages/Logs

Steps to Reproduce

1. Submit an issue (example https://github.com/anthropics/claude-code/issues/79240).
2. Find the Claude Issue Dedupe worfklow run corresponding to the issue https://github.com/anthropics/claude-code/issues/79240 without the expected comment.
3. Find the Claude Issue Dedupe worfklow run corresponding to the issue https://github.com/anthropics/claude-code/issues/78415 with the expected comment.
4. The workflow run output does not seem to contain an indication why the former issue (point 2.) is lacking the comment and the latter issue (point 3.) has the expected comment. More information from the Claude Code sessions may be present in the log files retained on the runner, possibly an interaction with another workflow.

Claude Model

Not sure / Multiple models

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.215 (Claude Code)

Platform

Anthropic API

Operating System

Other

Terminal/Shell

Other

Additional Information

This problem aggravates the https://github.com/anthropics/claude-code/issues/19267 issue.