[2021] Not able to unlock LC10 after update, is this a bug or am I failing?

So I haven't played for a few months and I wasn't around for the season 2 guns, so when I loaded the game yesterday I could see that I could unlock the LC10 in 15 MP matches. So, I started and saw the challenge tracking, great.

Update comes today and now I can't even see the LC10 at all, it's not even greyed out, it's just gone completely. The PPSH is there, greyed out, but no LC10. Also, strangely, I got a notification that I had unlocked the Mac10... a gun I have had since season 1...

Am I doing something wrong or did the update break some challenges? Oh, I also can't see last seasons AR, the FARA83 or whatever, that is 100% absent from my armory.