Hi! Many people including myself have experienced the following bug and there has been several posts on the BIF about it.
Basically with the new footsteps audio overhaul in 1.66 it introduced an issue where the player will hear their own footsteps coming from behind them if they're in first person, Which is very disorientating. Or to further explain. The footsteps audio is coming from the rear channel on a surround sound headset. Here's an image to demonstrate what I mean.
Prior to the update, Footsteps were heard in the center channel. But after 1.66 they're in the rear channel (Bottom red outline in the image)
which simulates hearing my ones own foot steps 2 meters behind the unit on screen.