Done End Cake (Doesn't work)

End Cake seems to be bugged, as it's usual way of eating it isn't letting us actually TP to the End with it's use.
We've wasted 3 cakes attempting different methods, so I assume we're either doing it complete wrong, or it's just completely broken.

 

you need 12 eyes of ender in your inventory when right clicking on it (i think)

 

pretty sure AS has end cakes disabled

 

Pi checked the configs, and it's indeed enabled.
It's also part of the questbook to complete "Mob hunters"