Whenever I use a firework when using elytra, the game puts me in perma fly mode. Even when I take it off, I'm still gliding. All mobs and other entities are frozen also, and when I "Save and Quit" it just shows the loading screen forever which means I have to force quit Minecraft just to reopen it again. Also, I can't take any screenshots because my world isn't even accessible.

EDIT: The glitch only happens when I use fireworks in my off-hand.