Boats are unable to push the entity upwards when teleported

I use /teleport to let boats move upwards, but they failed to push me towards that direction, thus I falling from boats.

I cant make a elevator in minecraft. How sad!

Steps to Reproduce:
1. Open the world I attached.
2. Imitate the behavior in the video.
3. Observe the results.
Observed Results:
I fell from the boats.
Expected Results:
I followed the boats up.