Or maybe even every session?

Fuck that… every frame.

Although, that was the experience with Stable Diffusion a few years ago. WAN Video is good enough for remembering the face during the course of the processed length (4-5 seconds or so). But, as soon as it needs any sort of object permanence, like when the face is hidden, suddenly, it doesn’t know what it was looking at any more. Seems like a solvable problem with reference images. I doubt NVIDIA thought that far, though.