[Bug]: Preview snapshot fails with "Preview tab ... was not found for snapshot"#31913

Area

apps/server, preview automation

Summary

A preview snapshot fails with the following error reported by the user:

The ellipsis is part of the supplied report, standing in for the tab identifier. The complete tab ID and tool response are not available in this report.

Steps to reproduce

The reported failure occurs when taking a preview snapshot in T3 Code. A minimal deterministic reproduction has not yet been established. The preceding tab lifecycle, including how the tab was opened and whether it was closed or restored, is unknown.

Expected behavior

A snapshot request for an available preview tab should return the page snapshot. If the tab is no longer available or cannot be automated, the response should explain its state and provide an actionable recovery step.

Actual behavior

The snapshot operation fails with Preview tab ... was not found for snapshot, preventing the agent from inspecting the requested page through that operation.

Version or commit

Not provided.

Environment

Reported while using T3 Code with Codex. The affected app version, browser runtime, and desktop/server configuration have not been confirmed.

Workaround

No confirmed workaround supplied.

Related reports

• #22612 includes the same snapshot error on native Windows, where a user-opened tab can be listed but cannot be automated.
• #19718 concerns an explicit desktop tab ID being replaced with a new server tab by preview_open.

These reports may be related, but the available details do not establish that this occurrence has the same cause.

Filed on the user's behalf from Codex. This report records the supplied error; it does not claim an independently reproduced failure.