[BUG] Migration from Claude code 4.5 to 4.6 re-establishes the issue where the /compact command does not function, and requires the /clear command in order to continue, which creates disruption in workflow

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?

Claude Code 4.6 reaches limits very quickly, and then does not self-compact. issuing the /compact command results in an error, which requires the /clear command, which imparts delays in workflows

What Should Happen?

Claude should continue to self-compact successfully, as in version 4.5

Error Messages/Logs

Steps to Reproduce

Run development across a complex multi-file project. Once 4.6 reaches saturation, the issue occurs

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

4.5

Claude Code Version

2.1.20 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PyCharm terminal

Additional Information

_No response_