I’m not sure if it’s the same kind of situation, but the Macedonian Wikipedia is absolutely rife with all kinds of nationalist pseudo-history and ethnic-based bias.

I think this is a problem for a lot of multilingual online platforms. On Facebook there are pages in Macedonian that constantly publish completely vile hateful material against Bulgarians, Greeks, and Albanians. These pages would absolutely be banned, except it seems that Facebook lacks the linguistic and cultural ability to understand what this content is and to do something about it.