[BUG] Claude Code v2.1.24+ broken on macOS - cache_control.ephemeral.scope error

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?

Anything later than v2.1.23 causes :
 API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"system.2.cache_control.ephemeral.scope: Extra inputs are not
permitted"},"request_id":"req_011CXoxb4QmrysjyNqcTUneF"}

What Should Happen?

Error: system.2.cache_control.ephemeral.scope: Extra inputs are not permitted

Details:

• Account: locotoki@gmail.com (Claude Max)
• Platform: macOS (M1), Portugal
• Works: v2.1.23 and earlier
• Broken: v2.1.24, 2.1.25, 2.1.28, 2.1.29, 2.1.31
• Same account works on Windows with v2.1.29
• CLAUDE_CODE_DISABLE_EXPERIMENTAL_BETAS=1 does NOT fix it

The "scope" field in cache_control.ephemeral appears to be rejected by my account's API endpoint. This may be region-specific or account-specific routing issue.

Error Messages/Logs

API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"system.2.cache_control.ephemeral.scope: Extra inputs are not
     permitted"},"request_id":"req_011CXoxb4QmrysjyNqcTUneF"}

Steps to Reproduce

anything later than v2.1.23 causes this error, for both Native and npm installation

Claude Model

Not sure / Multiple models

Is this a regression?

Yes, this worked in a previous version

Last Working Version

v2.1.23

Claude Code Version

2.1.23 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_