Wind Charge moves the player horizontally even when thrown facing straight down

if you look straight down and shoot a wind charge, your X and Z coordinates will be slightly and randomly shifted. You can observe X and Y coordinates changing in the attached video, even though the player is looking 90 degrees down.

Steps to Reproduce:

1. look straight down
2. turn on the debug screen and look at your X and Z coordinates
3. use a wind charge

Observed Results: X and Z coordinates change

Expected Results: the wind charge would knock the player straight up without any horizontal movement (no change to X and Z coordinates)