is patch 3.1 to blame?
Actually, you shouldn't underestimate the difference between 3.0 and 3.1; they are very different versions. It's clear that based on feedback from 3.0, they refined 3.1 with meticulous detail.
Added 1 minute ago
In my opinion, the Russian manual for 3.1 only exists in the lightweight version.
Are there any examples of where I can see the discrepancies? Just for my own understanding. I've already read the 3.0 manual quite a bit over the past 6 years of modding.