EDIT - As kapitainsky pointed out below, this is the wrong approach and the script below should not be used.
For me it works just fine after fixing the script by adding the --resync
option.
So my new script looks like this:
#!/bin/bash
path1=gdrive_[XXX]1:/
path2=/mnt/Disk2/gdrive_[XXX]1/
rclone bisync --resync --syslog --verbose $path1 $path2 &
path1=gdrive_[XXX]2:/
path2=/mnt/Disk2/gdrive_[XXX]2/
rclone bisync --resync --syslog --verbose $path1 $path2 &
path1=gdrive_[XXX]3:/
path2=/mnt/Disk2/gdrive_[XXX]3/
rclone bisync --resync --syslog --verbose $path1 $path2 &
And before the automatic script worked once again I needed to run it manually once.