Codex TUI output truncated in Zellij (scroll limit ~20 lines)

Codex version: codex-cli 0.57.0
Zellij version: zellij 0.43.0
OS: Ubuntu 24.04 (reproduced both on native install and WSL2)

Description:
When running codex interactive TUI inside Zellij, only about 20 lines of output are visible.
Scrolling in Zellij shows no history, while other TUIs (htop, opencode, claude code, etc.) display full scrollback correctly.
scroll_buffer_size is already set to 10000.
codex exec works fine.

Expected:
Full scrollback or at least configurable buffer inside the Codex TUI.