Hi there!
I've played a PvP Battle and I lost it due to that bug. The opponent had a Tornadus-T in the battlefield badly posioned (due to a previous Toxic) equipped with Rocky Helmet. I had at that moment Shedinja and I used Shadow Sneak, with Shadow Sneak damage + Toxic damage Tornadus-T should have died. Shedinja died due to opposing Rocky Helmet, Tornadus-T used a damaging move (and it failed) but suddenly the turn finished, without Toxic damage.
Please fix it asap because Toxic and Rocky Helmet are common move and item in PvP, I don't want to lose again due to that bug.
Regards.