Edit: Beta 0.8.1G
Fought against Lagon, fight worked fine, after the finishing blow he became invisible.
Just a visual bug, still could talk to him and receive his blessing.
Played a DoT Necro Lich build.
(+ have a smaller bug, where one notice I received gold (+17 gold) stayed all over the place; did not vanish, even when switching places; did not log out or exit the game for that)
Screenshot showing both issues: