I might have figured this out. I think the redirection <<< operator does not work in the sh shell it only works on bash.

Perhaps replacing the line 78 in bluetooth-control.sh will fix this?

Old: IFS=$'\n' read -r -a device_list <<<"$devices"
New: echo "$devices" | IFS=$'\n' read -r -a device_list

at first when i pushed, it was in bash. Later they changed it cause it was not working in ubuntu to use sh instead of bash :)

Ah I see. I pushed a patch after I was able to ran it locally.