Gold Camo for ballistic knife ,crossbow,shield but no diamond whas unlocked

[Gotrek]

hello , so i just unlocked gold assault shield camo i already had crossbow and ballistic knife
but for some reason diamond camo is not being unlocked ??

bug or

[Rickstasta]

I haven't done it myself but I have read in other places that you might need to get gold with the combat knife as well. Hit tab in Create a class to see camo requirements.