Weird FOV shifting on relog

When exiting a world, and entering one with a different FOV, the FOV breaks for a moment. To reproduce, drink a speed 2 potion and/or sprint, then exit the game while doing so. Entering a different world breaks the FOV for a moment, causing a nauseating zoom effect that your brain has a very hard time processing. I took these screenshots with quake pro, notice the FOV difference.