I noticed when reading a log from Crudeocean that there was something similar around those lines, and also saying stats/achievements not being tracked. This makes sense to me since my map has the SWLadder volume package, which is extra code, hence breaking the 'no-code' rule.
- but I haven't tested this out.
So what you say that some maps track and some don't, it could be because those maps have some code inside them. Since they are built for ONS 2.0 I'm not surprised.
nb: excuse my poor language skills this morning, just finished a 12 hour shift.