I start off by saying. 
I don't care is this reported before.
I care that it is not fixed since... The bow was first time coded to the game.

When you are shooting a bow The arrows don't update the direction of which you are aiming at unless you move atleast 1 full decree up or down or left or right.

Stand about 10/20 blocks away from a wall.
Shoot a arrow to a wall. Aim few pixels to the right. And repeat.
If arrow goes to somewhere else except the margin of error, we have turned 1 decree.
Repeat untill you have atleast 3 bulks of arrows on the wall.

I assume this problem exists on all of Bedrock codebase.