tmux screen become empty when the hint key was pressed.

[kyu08]

tmux screen become empty when the hint key was pressed.
To go back original screen, I have to press enter every time.

Is this caused by my configuration or environment or bug?

Environments

OS	macOS Ventura 13.4
tmux -V	tmux 3.4

My configuration

set -g @plugin 'fcsonline/tmux-thumbs'
set -g @thumbs-key 'f'
set -g @thumbs-osc52 1
set -g @thumbs-contrast 1
set -g @thumbs-command 'echo -n {} | pbcopy && tmux send-keys Enter'
set -g @thumbs-multi-command 'echo -n {}'
set -g @thumbs-unique enabled
set -g remain-on-exit off