Yet another Slim's mastery bug

Just see the screenshots.

On this one I was playing Hyde, if I recall it right, but took screenshot too late.

Fun thing is my Slim has a tier 2 leech gun mastry completed now because of this bug.
And one more thing - healing drone which does not heal.

I actually mastered Slim entirely through this bug…Yeah…

I’ve been getting these pop up as well…

You deserve the elite Rose. ^.^