[Zvez]

not a coincidence yandex has its own VCS (called arkadia). But not all services used it, some used github public and private. After war started, they had to migrate everything to internal vcs for obvious reasons.

So it makes sense they stopped committing to other repos somewhat around that date.

I don't have any inside knowledge now, but my guess would be that the leak is from 'on-prem' github.