TF2 - Server/Client hitbox mismatch

Описание: UPDATE: This was fixed in February 14, 2017 update.

So this happens in TF2 when you switch between certain classes (it's not specific to Scout). Model's running direction is wrong on server side causing player's hitboxes to mismatch on server and client while he is moving.
This bug has been in the game since launch.

TECHNICAL EXPLANATION:
The issue here is that different class models have different pose parameter indexes. Those indexes are cached by both client and server but server doesn't update them when you change class. As a result, "move_x" and "move_y" pose parameters become flipped.