Is the formatting of the print command using the print brief column command not supported any longer?
https://www.mikrotik.com/documentation/manual_2.6/Basic/Console.html#zzee_link_7_1028289098
v 2.6
[admin@MikroTik] interface ethernet> print brief column=mtu,arp
Flags: X - disabled, R - running
# MTU ARP
0 R 1460 enabled
1 R 1460 enabled
[admin@MikroTik] interface ethernet> print
v 6.12
[admin@MikroTik] > interface ethernet print brief column=mtu,arp
expected end of command (line 1 column 32)
[admin@MikroTik] >