When I was on my test world messing around with minecarts, I made it so a lot of minecarts where on the same rail... And when they started moving they where going of the rails and started going random ways... And when the minecarts all where out of sight I coudt still hear them like i was next to them... When i pressen Esc(Pause) and unpaused i did not hear this sound anymore... but a view hours later when i was still playing the sound came back... so i pressed Esc again and it was just coming back... over and over and over
I think this is a bug... For SURE!