I have had an issue lately where the mission does not end when I kill all enemies. I have explored the whole map and cannot find any more. I restarted the game and I the second mission had the same problem. It seems to happen when mist sentinels are in play.
This is an old bug and been around for some time! It only gets worse by the way, it starts like this then is stops working near the end of the mission and eventually your lucky if you can even get to move all your men before it stops, you can still move the screen and the animations still work etc… but that’s it! You need to open the console and type in WIN to end the round and move on with the game. However, the more complex it gets the more you need to do this! I find now I need to type win just to progress the game at all at this point as it will not complete any missions. It starts out great but once you level up and start to research and you get more aliens on the filed it just grinds to a halt! I do believe they are fixing this! Otherwise the game is just a waste of space!
I seem to be getting a spate of these. The game hangs during the alien movement and although the map stays functional the alien turn simply never ends. I have reported the crashes but it’s really taken the gloss off the game for me as I can spend ages an a difficult mission only to find I can’t finish and have to never return to that site as the same thing happens. Hoping we get a patch soon or new revision.