The same agent reports a model mismatch after switching models.

What version of Codex CLI is running?

codex-cli 0.144.1

What subscription do you have?

have

Which model were you using?

gpt-5.5

What platform is your computer?

macos

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

_No response_

Codex doctor report

When I started using an agent with the model GPT-5.5 High, after switching to a new model, 5.6 Luna, I felt it wasn't what I wanted. I used the `codex resume` command to restore the dialog and switched back to the previous GPT 5.5 model, but it prompted a model mismatch error.

What issue are you seeing?

When I started using an agent with the model GPT-5.5 High, after switching to a new model, 5.6 Luna, I felt it wasn't what I wanted. I used the codex resume command to restore the dialog and switched back to the previous GPT 5.5 model, but it prompted a model mismatch error.

What steps can reproduce the bug?

Uploaded thread: 019f2620-cc3d-7091-b66d-9937834f89be

What is the expected behavior?

_No response_

Additional information

_No response_