Indeed, I just tested Cyber Lancer (also Godot in 3D) and got a similar staggering issue, but when moving sideways. And nobody else mentioned it in the comments. I suspect a different framerate on different machines (GPU, esp. under Linux) causing some checks to be later than others? Or it could be a super low-level issue with the buffer where it shows intermediate frames it’s not supposed to, but that goes out of my jurisdiction of gameplay programmer.