Thanks for commenting it.I just played this map in v2.5 and did not know what to do, so I did it as "automatic mission" with the last save... I found this topic while wondering if posting it as a bug (if not already commented).
Really, I would not have expected such a thing as "solving a puzzle" to allow a mission in the battlescape. In any case, it add interest to the game mechanics.
After a long time, I'm trying v2.5 and I find it VERY exciting. Congratulations to the developers.