Quoting Nortalud,
Has anyone else noticed problems with heroes or other units disappearing after battle, despite having taken no visible damage during tactical combat? I've lost a couple now (one of them my spouse!) and can't tell if they're actually dying in combat but the damage suffered isn't animated, or if they're just randomly vanishing into the aether.
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I found this too from the last beta to now, if you auto-resolve combat this issue doesn't happen, if you use tactical resolution hand to hand damage is always resolved at the same time. Even if you kill the dude you hit first. You unit will remain on screen though wit h0 health and only die after combat finishes, one way around is to kill last opponent with a range weapon and prior to that heal any unit at 0 health once so they don't die, just are very badly hurt.
Maybe they can fix this, it only showed up after the patch that brought in 4 min size combat units and altered health of units. At least this is when I saw it first, and I noticed it the same way, you have clean wins on screen but people disappear after battles.
Cheers, CP.