Issue description

At Nushell startup, duplicate lines show up when we scroll up.

To reproduce, set the contents of ~/.config/nushell/config.nu to:

$env.config.show_banner = false

Use an empty Tmux config.

• Inside Tmux, run ls or another command a few times until the contents exceed the terminal height.
• Press Ctrl + B, Page Up a few times.

For some reason printing any line in ~/.config/nushell/config.nu avoids the issue:

$env.config.show_banner = false
print ' '

Required information

Please provide the following information. These are required. Note that bug reports without logs may be ignored or closed without comment.

• tmux version (tmux -V): tmux 3.5a
• Platform (uname -sp): Arch Linux
• Terminal in use (xterm, rxvt, etc): Ghostty
• $TERM inside tmux (echo $TERM): tmux-256color
• $TERM outside tmux (echo $TERM): xterm-ghostty
• Logs from tmux (tmux kill-server; tmux -vv new).