Failed fetch results in persistent 400 errors

What version of Codex is running?

codex-cli 0.61.0

What subscription do you have?

Pro

Which model were you using?

GPT 5.1 Max High

What platform is your computer?

Darwin 25.1.0 arm64 arm

What issue are you seeing?

Whenever a third party request fails, like let's say to read a readme from GitHub, it says it couldn't receive the documents because the sandbox permissions don't permit it, despite being in yellow mode. And thereafter, I keep getting 400 bad requests and the agent stays stuck at reconnecting. Resuming the conversation does not work and I need to start a fresh Codex instance to be able to fix the issue.

■ unexpected status 400 Bad Request: {
  "error": {
    "message": "Invalid value: 'other'. Supported values are: 'search', 'open_page', and 'find_in_page'.",
    "type": "invalid_request_error",
    "param": "input[495].action.type",
    "code": "invalid_value"
  }
}

What steps can reproduce the bug?

Uploaded thread: 019aa1d5-9c6c-7971-bbda-2e99a4b2ec8c

What is the expected behavior?

_No response_

Additional information

_No response_