Tried once again repeat a "unhealable paramedics" bug and found that (Lava is !!!fun!!!) - lava can kill dead persons (Zombies? Vampires? Daaaamn why i hired undead?!!) in awayteam (That even reflects in end statistic - like 28 casualties among the crew when you had only 10 for all time).
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Ahh also they stays at team as permanent dead crewmembers (or my captain just insane - loves to chit-chat with ashes of his crew). Easy repeatable.
If need i can send summaries, savegame (new team near at lava planet) and screenshots but as i said - Easy repeatable
Used Prospector Nosound vR176
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The crewmen who dies by other type of deadly things - removes normally - zombies still at team. Remembered also about undead treeman in old version (~2.3) but i'm sure what he died not from lava. But i remembers it pretty blurry.