The developers developed a mask for the characters.
The most memorable characters in Atomic Heart are twin robots who serve as Professor Sechenov's bodyguards. According to Youtuber BabyZone, twins aren't really robots.
The YouTuber removed the mirror panels from the robots' faces and showed how the twins really look.
During the filming, it became apparent that the twins are quite unusually sensitive to hitting their metal bodies. This is most likely the result of a software update that was required.
This is an interesting story.