That or you wouldn't want people to abuse the perma marks for actually non-permanent things such as a head on the tip of a spike, traces leading to the location of a body, or even ridiculous, non-immersive lines like "Bob was here" where you'd need a DM to erase it with godly erasers.
I know I'm making it dramatic and people having MPCs could have good use of it, but I feel like making it known (for those not seeing this post) can come with some risks.
However, it would be good to review the list of "lost command" has I've actually come up with a same issue concerning teleporting to the OOC room. The command wouldn't show in the "R" menu when in the vistanis' tent. A DM helped me after a bit, but even today I don't remember what it was, heh.