Sound not fading away after leaving area

I discovered a bug where the sound of guardians shooting their laserbeams would still be at max volume even if you are 50 blocks away from them

 

I was playing around with the new axolotl mob when suddenly I noticed the sound of the guardian's noise of attacking a mob didn't fade away the more distance I traveled. I stopped testing at around 50-60 blocks away from the source. The sound from other mobs in that area (Villagers, axolotls and squids) faded away as usual, except for the guardian's.