Hardcore Hero's Battlefield Varnak Spin to Win Bug

[Jeanne]

I first encountered this in 80 cap, and since then it has never happened to me again (I did quit for long periods of time, but I when I do play I do Hero's Battlefield every week). I thought it was fixed. And then it just happened again today. When Varnak uses Cyclone Axe, he sometimes spins forever, so he's i-framed for decades. Meaning that he can't be stopped. EVER. I tried to die, but he just kept spinning in the grey screen. It sucks cause the field takes my keys before completion rather than during, and now I don't have the rewards.

https://gyazo.com/af0213764beae476f5812ac3eda4ca03