Details:

Main problem:

An arrow is in the bottom of it's hitbox. If the texture is under a button by 0.5 blocks it activates it, if it is slightly above it won't register as a hit.
The arrow should be in the middle of it's hitbox.

Other issues mentioned:

From 190191 (resolved as dupe)

I uploaded the gif from that report to this report as it adds details. (ezgif-4-27e46e3d21b9.gif)

It seems like the arrow is drawn at the correct location relative to the player when shooting.

Conclusion:

Steps to solve:

• The hitbox of the arrow needs to be moved down by 0.25 blocks
• The texture of the arrow should be moved to the center

Affects:

• PvP (If the arrow has a larger hitbox downwards of the main texture you may be able to hit someone hiding behind a 2 block tall wall)
• Redstone / Buttons (Corrects the problem)
• Redstone / Target block (Needs remapping, a bulls eye should stay a bulls eye)