Just ran into a really strange glitch on my first playthrough. I was just talking to some mafia members at the start of the game, and suddenly I could no longer jump. the dust effect still appeared when I tried to jump, but no height. If I walked off of a ledge I would then float at the same height I was previously at. I could still dive and double jump while floating, but I never gained any height. I could definitely fly around as much as I wanted though, although I did sink very slowly while flying. When on the ground gameplay was normal, other than not being able to jump.

Not sure how helpful or how to reproduce the effect, but I did a little searching and couldn't find anyone talking about this particular glitch, so I figured I'd mention it. Unfortunately it fixed itself before I could get any footage.