How to reproduce: die, be revived by a player, be afk long enough that the others take the gate, on the level below you'll be alive with 3 health, if you die, there won't be the box for reviving with energy, there will only be the message about being able to be revived by other players and to press ATTACK to cycle view.

Also, there will be the winged heart above your corpse as if you were player revived.

My wild guess is that the flag HAVE_BEEN_REVIVED or whatever it's called isn't properly resetted when passing from level to level