Magisk boot script to freeze spotify android app until sd card is ready: /data/adb/service.d/spotify.sh and don't forget to chmod 755

spotify.sh

#!/system/bin/sh

A=$(getprop sys.boot_completed | tr -d '\r')
while [ "$A" != "1" ]; do
        sleep 2
        A=$(getprop sys.boot_completed | tr -d '\r')
done

pm disable com.spotify.music

A=$(find /storage/* -maxdepth 0 | wc -l)
while [ "$A" != "3" ]; do
        sleep 8
        A=$(find /storage/* -maxdepth 0 | wc -l)
done

pm enable com.spotify.music