Twice, but only twice, I've encountered a similar bug (in version 1.2): I couldn't walk on a certain square, but I saw nothing there, even if my soldiers were standing next to it, facing that particular square.
However those weren't aliens I had to stun, so I shot in the direction of that square, killing the "invisible" alien.
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A sickened, sensitive shadow writhing in hands that are not hands, and whirled blindly past ghastly midnights of rotting creation (Nyarlathotep, H.P. Lovecraft)
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