I can confirm that there is such a bug, it happened to my group in quite a funny way.
My soldiers detected the UFO and came all 8 surviving members of the team near the door, so the plan goes as such: break into the UFO, throw grenades inside, wait for the aliens to blow up, do hi-5 to each other over the dismembered extraterrestrials.
The team do brake it, throw grenades all over, none explodes, plan didn't work.
By the way:
In a certain rotation of the camera, the BLOCK (red text) falls directly on the TU cost and Percentage of hit, you should fix that, graphically and UI speaking, its a small-kind of-bug.
I was also excited to see that the original top down base returned.
Wonderful game, keep going!