Issue description

Hi,
kitty icat doesn't seem to work inside a tmux popup.
I found this issue was reported on the kitty repository but it seem to be a problem from tmux : see this link

kitty +kitten icat works properly :

When running it for a popup it doesn't work :

Required information

• tmux version (tmux -V).
  tmux 3.5a
• Platform (uname -sp).
  Linux unknown
• $TERM inside and outside of tmux (echo $TERM).
  inside tmux : screen-256color
  outside tmux : xterm-kitty