Not sure, could be a bug. or admins trolling.
haven't done much on source games. thinking of doing something
On some servers that arnt updated you can use the command z_spawn and spawn tanks and shit, It is unknown to me why this happens.
I'm not a coder I don't know how it works.
If you'd like you can join my Autism Awareness Group https://www.mpgh.net/forum/group.php?groupid=2181
If you'd like you can join my Autism Awareness Group https://www.mpgh.net/forum/group.php?groupid=2181