I expected to be teleport with my horse / minecart or at least without it.
I ate a chorus fruit, the animation appeared and it teleported me at my current positon : if I'm at x:0 z:0 y:70 and eat a chorus fruit, it teleport me at x:0 z:0 y:70 .
Step to reproduce :
Eat a chorus fruit while on a horse or in a minecart.
i don't know if that's a bug or it's an intended feature, but confirmed for 15w44b anyways.