Plutonium

I could be completely wrong but maybe Black Ops needs a mod loaded to allow cheat commands just to make sure you don't cheat the XP or something like that, maybe this was an old system, but again, just my random guess.

To avoid any commands issue or having to use devmap commands and stuff all the time I would recommend using a mod menu instead which will just work out of the box
https://forum.plutonium.pw/topic/22767/mp-encore-v8-mod-menu

KillerAndMX It does make sense, the team doesn't randomly remove things for fun.
It was removed because some cheats could use that from what I have been told.
There might be a way to enable it with gsc but idk about that

Resxt I think i remember how i made it crash in the first place.
Last time i was playing, i was on a private match alone messing with the commands, when by curiosity i ran a command that was supposed to start singleplayer campaign, the game crashed and i left it there for the day.

The next day i tried to play i had the issue already.

The game used to work with no issues before that

(For some reason my reply got posted on a different thread)