I tried Windows 'game bar', but it said it couldn't record the desktop (didn't recognize X-Com as a game?)
I tried Fraps, which could record. There was sound, but the screen was black (also couldn't record X-Com screen).
On a landed battleship mission I had it once. I think the icon was pink(?)
My soldier was on an elevator, and when I pressed the '1' icon it shortly jumped one level above the soldier and then jumped back down again. My soldier saw either a sectoid or one of those flying saucers (2x2 tiles) that explode when you kill them.
If you can't reproduce it, then never mind. I hate to take time from you. I already reported 4 bugs in the last week or so (all but this one got fixed!)