exec_publish and exec_publish_done not working in nginx rtmp :(

I have volunteered to do livestream at a conf. The plan goes like obs-> nginx rtmp (on a vm on a vps)-> youtube cause we wanted to have a fallback mechanism where when obs fails a fallback.mp4 sended to youtube by ffmpeg on a loop until obs gets back. so that
the user can have a seamless experience. i have pulled off the nginx setup, both on local and docker but i can’t pull off the fallback mechanism. please take a look at my config:

ngnix.conf

worker_processes auto;

events {

    worker_connections 1024;

}



rtmp {

    access_log /var/log/nginx/rtmp_access.log;

    server {

        listen 1935;



        application live {

            live on;

            exec_publish /bin/bash /scripts/stop-fallback.sh;

            exec_publish_done /bin/bash /scripts/start-fallback.sh;

            push rtmp://a.rtmp.youtube.com/live2/stream_key;

        }

    }

}

start-fallback.sh

#!/bin/bash

echo "$(date): start-fallback.sh called" >> /tmp/fallback.log



FALLBACK_VIDEO="/videos/fallback.mp4"

RTMP_URL="rtmp://localhost/out/fallback"



/usr/bin/ffmpeg -re -stream_loop -1 -i "$FALLBACK_VIDEO" -c:v libx264 -c:a aac -f flv "$RTMP_URL" &

echo $! > /tmp/fallback.pid

echo "$(date): fallback ffmpeg started with PID $(cat /tmp/fallback.pid)" >> /tmp/fallback.log

stop-fallback.sh

#!/bin/bash

echo "$(date): stop-fallback.sh called" >> /tmp/fallback.log



if [ -f /tmp/fallback.pid ]; then

    kill $(cat /tmp/fallback.pid) && rm /tmp/fallback.pid

    echo "$(date): fallback ffmpeg stopped" >> /tmp/fallback.log

else

    echo "$(date): no fallback pid found" >> /tmp/fallback.log

fi

Ive tried all sorts of things, even tried replacing start-fallback.sh with echo "test" > brr brr did not get created. ive manually ran the scripts. its working fine, also stream successfully reaches youtube, but exec_publish and exec_publish_done never worked. i just want to get it to work. ive tried docs, ai, friends, so if you can help me, please