It seems that Supernova when used to kill the enemy hero leads to server hiccups / seemingly random defeats. I've rewatched 2 matches today where I finished off my opponent with Nova and it wasn't shown even in my own replays. The penultimate card was shown and then nothing. It seems that the server cannot save matches correctly that end that way. Supernovas become black server holes, basically.
Not sure if it matters but my opponents (DelKim2003, iir the name correctly, and Swarog) had an ally in play when I used Nova and right before the victory screen appeared these allies were still on the board even though they should've gone to the graveyard simultaneously to the hero reaching 0 hitpoints.
If the bug is indeed caused by hero and ally dying at the same time then the same thing would probably happen when using lightning strike as a finisher.
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