[BUG] Desktop 1.49585.0 (Windows): prompt suggestions gone after update - spawned CLI launched without --prompt-suggestions (same signature as #90464)

Summary

Prompt suggestions (the suggested next prompt/command offered at the chat input in Claude Code sessions inside Claude Desktop) stopped appearing immediately after updating the Windows desktop app from 1.46388.4 to 1.49585.0. Nothing changed locally: no setting, no config key, no reinstall. The desktop-spawned CLI processes on this machine are launched without --prompt-suggestions, which is the same signature reported in #90464 (macOS, mid-August).

Environment

• Claude Desktop for Windows 1.49585.0 (Windows 10 Pro 19045)
• Previous build 1.46388.4; update staged 2026-09-09 04:51 (+10:00), first launch of 1.49585.0 2026-09-10 13:31 (+10:00)
• Bundled CLI used by the desktop app: 2.1.260 (%APPDATA%\Claude\claude-code\2.1.260)
• Standalone terminal CLI (separate lane, not the subject here): 2.1.227

Symptom

Suggestions were present before the update and have not appeared in any session since the restart that applied it.

Evidence

1. Spawned CLI is missing the flag. Of the 5 live desktop-spawned CLI processes (claude-code\2.1.260\claude.exe ... --output-format stream-json):

• --replay-user-messages present in 5/5
• --include-partial-messages present in 5/5
• --prompt-suggestions present in 0/5

Per the analysis in #90464, these are set together at session creation, with promptSuggestions behind a host-side gate check, so a missing flag means that gate evaluates false on this install.

1. No local cause. No promptSuggestion* key anywhere in %APPDATA%\Claude\config.json, Local Storage, Session Storage or WebStorage; nothing suggestion-related in ~/.claude/settings.json or settings.local.json; CLAUDE_CODE_ENABLE_PROMPT_SUGGESTION unset.

1. Not shipped in the Electron shell. No suggestion-related strings in resources/app.asar or resources/en-US.json in either 1.46388.4 or 1.49585.0, consistent with the feature being host-gated rather than bundled, so the version change alone does not explain it - but the changepoint here is exactly the update.

Ask

• Is the desktop gate off intentionally for 1.49585.x, or did it regress with this build?
• If it is intentional, please expose a user-facing setting. From the user side the feature simply vanished after an update, with no setting to check and no way to tell whether it is a bug or a removal.

Related

• #90464 - same symptom and same missing-flag signature on macOS, mid-August
• #79919 - suggestions never appearing in the GUI app despite promptSuggestionEnabled: true