Custom chat titles not reliably shown in /resume and not synced across machines

Description

When renaming a chat from the tab UI, the custom title does not appear in /resume. The custom-title entry is correctly written to the session .jsonl file:

{"type":"custom-title","customTitle":"Launch Claude","sessionId":"29e26940-ba97-4717-90fd-3efe57dc0f35"}

But /resume still shows the auto-generated title instead of the custom one.

Note: renaming via Ctrl+R from the /resume list works correctly and syncs across machines.

Environment

• Claude Code CLI (portable setup with CLAUDE_CONFIG_DIR on Google Drive File Stream)
• Windows 11

Expected behavior

After renaming a chat from the tab UI, /resume should show the custom title.

Actual behavior

The custom-title entry is written to the .jsonl file but /resume ignores it and shows the auto-generated title.