[2020] "Impossible" kill-shot through an undamaged wall, twice?

Originally posted by Hurricane: I had a game where I was shot dead through a wall.
It happened twice, both times by the same player.
The second time he had no way to have seen me at all: no door nor opening. I thought I was safe.
The replay shows him running in the bank corridor, then point at the dark wooden wall and shot me dead.

A team mate told me there was some kind of "wall-hack" perk in game that allows that.

Anybody could explain this to me?

Can we get a video of this to look at? Do you happen to remember which map it was on and where exactly it happened?