Closer Quarters Challenge done but prize weapons still locked

There's multiple reports on reddit (including myself) of players completing the Close Quarters Challenge (1 and 2) and either the SCW-10 or SL9 games being still locked. Playing more games, restarting the game, restarting the PC, waiting days, etc. None of those helped;

Example report:

Compleed the Close Quarter 2 but the SL9 still locked? : r/Battlefield6 

Completed “CLOSE QUARTERS 1”, SCW-10 remains locked??? : r/Battlefield6

SCW-10 not unlocking : r/Battlefield6

Issue unlocking SCW-10 : r/Battlefield

Got the challenges auto completed but the guns didn't unlocked : r/Battlefield6

And each of them have sometime dozen of players reporting the same issue. This is frustrating as they are considered some of the best weapons in the game and are now impossible to unlock.