Oberon just revived 3 times in a row.
Even though I had 2x Grimm and Hu Tao charged up, I did not waste a special.
Sequence of events
Oberon physical attack in 3 turns
Killed Oberon with a massive combo
Revive symbol flashed
Oberon revived
Boss null turn - physical attack in 2 turns
I killed him with Hu Tao
Revive symbol flashed
Made a match ( finishing my turn even though I had two fully charged Grimms )
Oberon revived
Boss null turn - physical attack in 1 turn
I killed him with Little John
Revive symbol flashed
Made a match ( finishing my turn even though I still had not used either Grimm )
Oberon revived
Boss used physical attack against Little John, next physical attack in 3 turns
I killed him with papa Grimm
No revive symbol - stayed dead.
My personal opinion
Petri, I strongly recommend adding a grave marker icon to dead heroes reviving at the end of turn.
Users are trained to track status icons and it will make screen shots more easy to interpret for sorting the mistaken bugs from the actual bugs.
With no icon, only a screen casting allowed me to figure out what the Flying Spaghetti Monster was going on.