Llamas refuse to follow each other down a mountain

its easy to see that the Llamas are really trying to follow each other as intended... but when going down a mountain its looks like they trying to find a big peth down the mountain. its like they want a stair of 2x2 blocks size which is a problome. Llamas should be able to use 1 block size stairs with out getting any fall damage. they should also be able to jump 2 blocks down if needed (its not high enough to damage them)

its abit like they scard of fall damage abit too much... and its ruining the caravan.