Just had the following issue which has killed my perfect run on ATV on the last node to be played. Bottom node with screenshots below.
PW: Sarkhan Unbroken (me) Lvl. 57 vs. Huatli, Warrior Poet Lvl. 60
I had a Major Tarkir Dragon token on the board and used Inscription of Abundance to add life then used the kicker ability to buff my dragon and fight the opposing creature. The opposing creature was the Sun-Blessed Mount token which died when hit but also killed my dragon token. The issue seems to be that the Sun-Blessed Mount token has not actually died as I can click on empty pixels and the card abilities are still there.
https://imgur.com/a/Tu2u5YG