Output is disappearing when scrolling back inside a multiplexor

What version of Codex is running?

codex-cli 0.46.0

What subscription do you have?

Plus

Which model were you using?

gpt-5.2-codex

What platform is your computer?

Darwin 25.3.0 arm64 arm

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

Ghostty

What issue are you seeing?

Output disappears when scrolling back in Zellij panes. When using the mouse wheel or trackpad to scroll up through terminal history, previously displayed text vanishes or shows blank spaces instead of the expected content. This issue seems to stem from conflicts between the terminal emulator's scrollback buffer and Zellij's internal buffer management. It's strange that I can return to the point where I ran the command to open Codex before seeing any of the Codex output besides what was in my view already.

<img width="767" height="259" alt="Image" src="https://github.com/user-attachments/assets/347080d6-0362-44a7-9d94-901ef04e6c6e" />

What steps can reproduce the bug?

1. Launch Zellij in your terminal
2. Run codex
3. Send a prompt that generates output longer than the visible terminal height
4. Wait for the complete output to be displayed
5. Attempt to scroll up using mouse wheel or trackpad to view earlier output

What is the expected behavior?

Previously displayed output should remain visible and readable when scrolling up

Additional information

_No response_