[.]

Except...they would have to take away people's mastery. I got my 3k from my K-drive, because the bug is actually only affecting purchased K-Drives. If you craft the K-Drive you gain the Mastery as normal. But there seems to be an extra part of the bug, but since I haven't personally tested this don't take it as fact, if you bought and leveled a bad baby for example, and then crafted a bad baby and leveled it you don't get MR. Which is not good. 

But, MR is working fine for K-drives as long as you just crafted it, and never bought and leveled a purchased K-drive.