I can confirm this bug. The system is a 3.22 mikrotik on a Pc Engines alix6b2 board.
/user set system password=01234567890123456789012345678901
/user pr detail
Flags: X - disabled
0 ;;; system default user
name="system" group=full address=0.0.0.0/0
/user group pr detail
0 name="read" policy=local,telnet,ssh,reboot,read,test,winbox,password,web,
sniff,!ftp,!write,!policy
1 name="write" policy=local,telnet,ssh,reboot,read,write,test,winbox,password,
web,sniff,!ftp,!policy
2 name="full" policy=local,telnet,ssh,ftp,reboot,read,write,policy,test,winbox,
password,web,sniff
Setting the password to 32char i cannot login with ssh [telnet,winbox,mac-telnet yes i can] with user system:
system@192.168.1.10's password:
Login failed, incorrect username or password
echo: system,error,critical login failure for user system from 192.168.1.217 via
ssh
echo: system,error,critical login failure for user from 192.168.1.217 via ssh
Please look at the last line of the log.... there isn't the name of the user.
but only I need large passwords