Masterkey attachment bugged

So yea, the masterkey attachment seems to be bugged and not working, I got the Titus weapon and Commando multiple attachments from random weapon and both of em have the masterkey attachment but it doesn't work. Don't know about grenade launchers, they might be bugged too, haven't tested yet, here is a screenshot what i mean: https://steamuserimages-a.akamaihd.net/ugc/863981579884851820/746AFC07B51680DB15107799DF4ADC76400593A5/

PS: The axis zombie is still bugged, i made a topic about it like 2 weeks ago so might wanna look into that aswell, here is the link for that: