This might not be a bug, I'm honestly not sure. Basically, my audio sounds incorrect compared to what it should sound like. On versions lower than 1.20.2, my audio is completely fine, as it is with any other game or website that plays audio. So I know this is at least has to do with Minecraft. It only happens on 1.20.2, no other versions seem effected. This also effects vanilla sounds and music too, so it's not strictly our custom stuff. (Tested with Pigstep disc, same deal).

I have provided a small clip of me playing a custom song, it jumps between 1.20.1/1.20.2 to show how the audio sounds between versions. (Had to reduce video quality to upload so it sounds a little less appealing though, apologies for that).