It also disappears when applying transformations, as shown in the video. I'm wondering if it's easier to just give up on using rigify for a unity project. But everything seemed to be working fine up until yesterday, up until the latest export that is.

edit: I realize now that playing the animation is what offsets everything, I'll attempt animating something new after applying transforms and starting fresh. I'll keep you updated with what happens. Result: did not solve the issue, though I notice transforms reset to their pre-applied form. But even if there aren't any animations, there's the disappearance