For a great sci-fi treatment of the dangers of mirror life, see Fantastic Four 5-6 (2023) by Ryan North. Yes, that Ryan North, and no, it's not your "typical" comic book.

I've heard that his Hulk run is also excellent.

Anyway, Peter Watts' Rifters series is another excellent take on the genre, although it's not mirror life per se. (And it's ... not a happy read.)