How to reproduce
Shoot an arrow and look at the blue line with hitboxes turned on (f3+b)(indicating direction) or use carrots with the arrow selected in a command

Observed Results
The direction arrow hit face is different depending whether it is facing the x(-x) or z(-z) axis (making it difficult to do commands with carrots (^) ) at least not consistent

Expected Results
The direction would go the same direction the arrow model faces. If nothing else be consistent