On a retaliation haven defense mission with a low rank squad in cast off gear, was really tough but just about made it so everyone could escape (except for 2 civs I could not find anywhere on the map, finding the ppl to rescue is the hardest part of the mission - you'd think they would be screaming to be rescued)
Unfortunately the 'lid warrior & hive queen who were burning destroyed most of the wooden platform my sniper was on. She was still standing up there unable to move anywhere. She probably should have fallen and taken damage but didn't, which meant that she was the second first mission casualty (just picked her up from a jail) of the campaign. So annoying, she was a blue move from evac and I had played very tight to get everyone to survive (arc thrower & sting nades FTW)
Probably a base XCOM 2 bug, but I have a savefile if you would like to take a look.