Silverfish do not use their footstep sounds

Despite having distinct footstep sounds in the game files in addition to unique sound events for these footstep sounds, Silverfish do not use any footstep sounds at all in-game. 

no_silverfish_footsteps.mp4

minecraft-sounds-mob-silverfish-step1.ogg

minecraft-sounds-mob-silverfish-step2.ogg

minecraft-sounds-mob-silverfish-step3.ogg

minecraft-sounds-mob-silverfish-step4.ogg

Here is a video demonstrating the sound event working in-game:

sound.mp4