I have created a popup in tmux to switch session faster but it doesn't work as expected.

bind-key P run-shell "tmuxifier ls | fzf-tmux -p | xargs tmuxifier load-session"

Creating the session for the first time doesn't switch client. After the session is created, switch client works.
How can I debug the problem myself?

tmux 3.3a
tmuxifier 0.13.0
fish, version 3.6.1