items move through solid blocks when you die falling at high speed

I built a monster spawner real high in the sky (200 blocks). Was building it fully functional where you would fall to your death to get out and have hoppers collect your stuff to chests. This was a fully enclosed vertical pipe structure 40 ish block fall with hoppers at the bottom and a stone floor underneath.

What happened was when i fell to my death the items would end up at the ground level (64 blocks) passing through the floor the the direction i was traveling

What I expected to happen was...:
Describe what you thought should happen here

1 build something high in the air to fall from in an enclosed pipe/tube
2 40 something block lower put the floor
3 fall
4 see where your stuff ends up