I was killing some withers on a multiplayer server as a vampire/vampire bat, when I suddenly couldn't switch between them anymore. When I pressed G it brought up the cooldown bar but didn't change me. I tried relaunching the game, reinstalling the mod, and restarting the server, but nothing worked. I am using mod version 1.6.2 on Minecraft 1.18.2. Also, when you leave the end as a vampire bat you can't fly any more until you switch to vampire and back.