[BUG] Gmail connector stops returning mail addressed to a Workspace alias after a date; the Gmail app still shows it

Summary

The claude.ai Gmail connector, used from Claude Code, stopped returning messages addressed to a secondary alias of a Google Workspace (university) account after 2026-10-05. The same messages show up in the Gmail mobile app for that account. Mail addressed to the account's primary address is still returned normally.

What I see

• search_threads with in:anywhere to:<alias> returns about 200 threads. The newest is dated 2026-10-05 18:59 UTC.
• Nothing addressed to the alias after that date is returned, including a message received on 2026-10-08 that the Gmail app shows.
• Mail addressed to the primary address after 2026-10-05 is returned normally (newest 2026-10-10).
• Messages I sent from the account on 2026-10-08 were also not returned by in:sent searches.

Searches tried (all returned {})

• in:anywhere to:<alias> newer_than:5d
• in:anywhere deliveredto:<alias> newer_than:5d
• The sender's domain and distinctive subject keywords, with includeTrash: true

Expected

Messages delivered to an alias of the connected account are searchable, as they were before 2026-10-05.

Environment

• Claude Code 2.1.296, Windows 11
• claude.ai Gmail connector
• Google Workspace (university) account with a secondary address alias

Notes

I have not ruled out a routing change on the Workspace side around 2026-10-05. Reporting because the Gmail app shows the message in the same account while the connector does not.