Certain Commands return in putty but not Renci.SsshNet

Hey, i am using the SSH library for a backup tool and i find with certain commands i dont get anything returned, i have the output redirected to a text document
For example in putty (i have * out some info):

arp -e
Address HWtype HWaddress Flags Mask Iface
192.168.. ether 1c:59:::: C wlan0
192.168.. ether 10:f0:::: C wlan0
in Renci.SshNet is just an empty string get returned

Its not even that its reading the args wrong as this works fine
putty:

uname -a
Linux raspberrypi 4.9.35-v7+ #1014 SMP Fri Jun 30 14:47:43 BST 2017 armv7l GNU/Linux
Renci.SshNet:
Linux raspberrypi 4.9.35-v7+ #1014 SMP Fri Jun 30 14:47:43 BST 2017 armv7l GNU/Linux

The other one I've noticed is the service checker (again replaced some info with *)

service --status-all
putty:
[ * ] alsa-utils
[ * ] avahi-daemon
[ * ] bluetooth
[ * ] bootlogs
[ * ] bootmisc.sh
[ * ] checkfs.sh
[ * ] checkroot-bootclean.sh
Renci.SshNet is an empty string

Tried on Raspian and a Ubuntu Server edition, and adding 2>/dev/null with no change on either platform

Riprodurre il comportamento con arp -e e service --status-all tramite Renci.SshNet, confrontando il loro output reindirizzato con uname -a negli ambienti Raspbian e Ubuntu segnalati. Determinare se il testo mancante viene restituito tramite uno stream diverso o se è influenzato dall'esecuzione del comando, e considerare conclusa la issue quando questi comandi producono l'output previsto.