When creating a new world in the latest snapshot, I began noticing that when I tried to follow the sounds of mobs, I could not find them as I was mining towards which side of my headphones the audio was coming from. The sounds were getting quieter as I tried to get closer. I noticed that when I went in the opposite direction, I could find the source of the sound. 

I tried creating a few worlds and testing it by standing next to a TNT block as it was exploding, and sure enough, the sound came from the opposite side in my headphones than my character was facing. No, my headphones are not on backward, and earlier versions of the game do not replicate the same glitch. There is no spot in the audio settings for me to check if the audio is reversed in my settings, and my settings are all fine on my own device.