Fast mode activates on its own

What version of Codex CLI is running?

codex-cli 0.130.0

What subscription do you have?

Business

Which model were you using?

gpt-5.5

What platform is your computer?

Darwin 25.3.0 arm64 arm

What terminal emulator and version are you using (if applicable)?

iTerm2

Codex doctor report

Not working (`error: unexpected argument '--json' found`)

What issue are you seeing?

Codex seems to automatically activate fast mode, despite me neither explicitly (with the slash command) nor implicitly asking for it. I can deactivate it with /fast, and I can see it get deactivated (fast disappears from the bottom of the CLI as expected), but after a few messages it comes back on its own.

What steps can reproduce the bug?

See above

What is the expected behavior?

_No response_

Additional information

_No response_