Have run a few missions in 18.5 - no saving/loading involved.
First instance, Ground Force was hit by alien 2 times on 2 separate turns, third turn he dies from his wounds. Score at the end lists as killed by Xenonaut forces
Second Instance - Civilian was hit by alien first round, next round sound of human death, and Score at end lists killed by Xenonaut forces.
Is this counting like this since I never attempted to heal them? Can you even Heal a Civilian or ground troop?
Good news, Saving no longer eliminates the "Secured UFO" points where it did in 18.4. Verified with Saving each turn, and loading a save file.