Bug: Ocassionally plex_update.sh error when running No Docker setup.

[kent-chan-dev]

Expected Behavior
I expect the script to run properly, however it is giving this error when running No docker setup.
What could be causing the issue?

Appears to be happening when adding movies, however it works without issue when removing movies.

2024-04-15T00:59:53.245Z ERROR manager Failed to execute hook on_library_update: error executing script: exit status 2; stderr: plex_update.sh: 19: Bad substitution

Actual Behavior
My plex_update.sh file

plex_url="http://localhost:32400"
token="mytoken"
zurg_mount="$HOME/torrents"

section_ids=$(curl -sLX GET "$plex_url/library/sections" -H "X-Plex-Token: $token" | xmllint --xpath "//Directory/@key" - | grep -o 'key="[^"]*"' | awk -F'"' '{print $2}')

Operating System
Ubuntu Server

Environment Setup
Are you using Docker, or are you using Zurg's binary? Not docker.
If Docker, please include your docker-compose.yml.
If Zurg's binary, specify the version by running ./zurg version

[petern-sc]

What do you have set for on_library_update in your config.yml?

on_library_update: /root/zurgfiles/plex_update.sh "$@"

It was previously sh /root/zurgfiles/plex_update.sh "$@", after dropping sh it worked properly for me.