Encrypted content could not be verified (broken session)

What version of Codex is running?

codex-cli 0.73.0

What subscription do you have?

API key

Which model were you using?

gpt-5.2

What platform is your computer?

Darwin 25.1.0 arm64 arm

What issue are you seeing?

Thread ID 019b2862-2623-7143-9c9f-a45075da54dd died with this error:

■ {
  "error": {
    "message": "The encrypted content gAAA...c90= could not be verified.",
    "type": "invalid_request_error",
    "param": null,
    "code": "invalid_encrypted_content"
  }
}

What steps can reproduce the bug?

Uploaded thread: 019b2862-2623-7143-9c9f-a45075da54dd

I have no idea how to repro it. Codex has been working fine for a while already today.

What is the expected behavior?

Server-side encrypted content should always validate.

Additional information

_No response_