I ran NGN on my neglected Fire toon last night, and during those numerous runs I noticed that the Artifact weapons no longer granted you the corresponding Weapon Mastery. I know the sequence between picking up the weapon and using it in the second boss room is pretty short, but it feels so weird not being able to perform Weapon Mastery with said weapons. I have zero clue about how this new bug tracker works, so I don't know if this has been reported yet, or even how to go about reporting it.