Powerline init not executed on first session creation

[StopMotionCuber]

Hey, I would like to utilise the fancy window list, but that doesn't work right now for me, as it seems the tmux set-hook -g session-created "run-shell '${TMUX_POWERLINE_DIR_HOME}/powerline.sh init'" doesn't seem to run on initial session creation.

Steps to reproduce

Assumption: tmux-powerline is configured properly, according to README

1. Close all tmux sessions
2. Start a new tmux session with tmux
3. Wait for powerline to load

Expected result

The window list is not the default window list and has a powerline style

Actual result

The window list has the default style

Workaround

Starting a second session leads to the expected result.

Further notes

I think this is caused by the session-created hook running before loading all the plugins and stuff. It would be fixed by adding ${TMUX_POWERLINE_DIR_HOME}/powerline.sh init to the end of the main.tmux file. I'm not sure whether there would still be a reason for keeping the hook then. I also don't understand the reason to go for a hook here in the first place.