^{Update from EVGENSYPERPRO}

Summary:
Falling through trapdoor when reloading crossbow at certain heights (31, 63, 127, 255). 

Steps to reproduce:

1. Place the horizontal bottom trapdoor at any height of 31, 63, 127, 255.
2. Take a crossbow.
3. Stand on the trapdoor and load the crossbow.

Observed results:
Player falls through the trapdoor.

Expected results:
Player does not fall through the trapdoor.

Original description:

falling thru horizontally placed trapdoors on water, while reloading crossbow.