Shift+Enter on Windows produces letter "C"

What version of Codex is running?

codex-cli 0.39.0

Which model were you using?

gpt-5-codex

What platform is your computer?

Microsoft Windows NT 10.0.26100.0 x6

What steps can reproduce the bug?

1. Run the codex command and wait for the TUI to appear
2. In the input box, press shift+enter

What is the expected behavior?

it should produce a new line instead.

What do you see instead?

simply the character "c" like this below:

To get started, describe a task or try one of these commands:

/init - create an AGENTS.md file with instructions for Codex
/status - show current session configuration
/approvals - choose what Codex can do without approval
/model - choose what model and reasoning effort to use

▌ ccccccccc
⏎ send Ctrl+J newline Ctrl+T transcript Ctrl+C quit

Additional information

<img width="1176" height="413" alt="Image" src="https://github.com/user-attachments/assets/b7ddbac3-9afe-4862-b03f-564facff6a3f" />