[BUG] Prompt Suggestions setting not persisting across sessions

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?

Setting "Prompt suggestions" to true via /config does not persist when starting new Claude Code sessions, only for the current session when it was enabled.

The setting.json promptSuggestionEnabled has no effect on the behaviour / persistence.

<img width="420" height="103" alt="Image" src="https://github.com/user-attachments/assets/c0a4aaf1-7ff4-4f29-8cd1-53b3282e83c8" />

Current session for which prompt suggestions has been enabled / set to true

<img width="514" height="208" alt="Image" src="https://github.com/user-attachments/assets/897c2b45-6d42-4a8f-a8a0-9057404417ce" />

Exiting claude and relaunching claude from the same terminal or in a 2nd terminal reverts the prompt suggestions back to false

<img width="570" height="262" alt="Image" src="https://github.com/user-attachments/assets/16bceffc-3d06-41ad-bcd5-05f39b3b6bf0" />

What Should Happen?

Like all other config options, setting Prompt suggestions to true should persist when starting new sessions.

Error Messages/Logs

Steps to Reproduce

Setting prompt suggestions to true in /config exiting the session and starting Claude and in /config the setting will revert back to being false

Claude Model

Not sure / Multiple models

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

2.1.11 (Claude Code)

Platform

Other

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

_No response_