tmux run-shell fails to run the script with error code 2

[rbhanot4739]

Hello,
I have the following script which runs just fine when I run it from shell directly within a tmux session. However when I try to run it as tmux run-shell it fails with error code 2.

test.sh

#!/bin/bash

run() {
  delx_() {
    ans=$(echo -e "Yes\nNo" | fzf)
    if [ "$ans" == "Yes" ]; then
      echo "Kill $1"
    else
      echo "Nooooooo"
    fi
  }
  export -f delx_
  del_bind="del:become:(delx_ {})"
  binds=" --bind \"$del_bind\""
  fzf_cmd="fzf $binds "

  shell=$(which bash)
  ls | SHELL="$shell" eval "$fzf_cmd"
}

run

Running directly from terminal works fine /bin/sh $HOME/test.sh. However doing tmux run-shell "$HOME/test.sh" fails with /Users/rbhanot/test.sh' returned 2. This is a simplified version of my script and eventually I want to map this script to a keybinding in tmux, so that I run it quickly but I am not sure why it is failing, so something like this bind M-m run-shell '"$HOME/test.sh"'.

I tested this both tmux version 3.4 and 3.5 and got the same error, so I guess there is something wrong with what I am doing but I am not a shell wizard, so not sure if I am missing something obvious here?

Infact here is a dead simple version of the same which fails with exact same error

test.sh

ls | fzf

Run it with tmux run-shell "$HOME/test.sh" and it fails.

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