Major Bug - Covers deleted off the vine

Well, I just verified a new bug, and it's a doozy!

The first time it happened, I thought I had imagined it. Then it happened again, and I wondered if there was a pattern. Reproduced it again just now, and it is definitely an issue.

The bug deletes covers from my vine when I champ a character. How I reproduced:

I had three covers on my vine; one spare of a 4a5 550, one spare of a 4a5 with a rostered dupe, and one spare of a level 370 4 star with no dupe. (I wanted to test if it was a particular type of character that got deleted; the first time was a 5* 550 dupe, the second was a 4a5 550).

Opened some tokens, enough to give me 13 covers of a a 4* character.

Added 13th cover, leveled them to 270, and champed them.

All three covers on the vine were gone!

So yeah, if anyone else can reproduce, I'll be interested, but it is certainly a nasty one.