Mosin Obrez doesn't count towards challenges.

I mean it says "Deal damage to enemy hunters using any Mosin-Nagant variant.", shouldn't it count Obrez too? I had an amazing game where I thought I did like 70% of a challenge but when I returned to lobby I haven't done any progress. I really hope it's a bug because in an unforgiving game like Hunt where you can die at 20 minutes in the match to the unsuspected headshot without firing single shot, it can be really frustrating. And besides basic 3 slot Mosin costs 620 dollars now so it can really quickly sap your finances.