My arcane builds are Eldritch Knights until roughly level 12. I pass around a Carnifex as I need and just cast Master's Touch on it to have proficiency with it.
Last night (Friday, June 30th) I noticed that I still had the message on my screen that I'm not proficient after I cast the Master's Touch spell while holding the Carnifex.
I figured it might be bugging and it may go away the next time I log in. Logged in tonight and tried it again with the same result.
Does anyone else have this issue? I've been doing this with no problems for over 6 years on all my arcane casters.