Reducing pops between tracks MAX98357

I connected MAX98357 to my RPi4.
Because drivers are already in kernel I just add below line to /boot/config.txt 

dtoverlay=max98357a,no-sdmode

and everything works fine except annoying pops and clicks when I start playing or changing track.

The reason of these noises is described in this post:
https://forums.adafruit.com/viewtopic.php?f=50&t=104049

Simplest solution is just play silence to avoid I2S clock frequency changes, and perfect will be play it after system starts.
To do this I created small systemd service as below:

[Unit]
Description=Invoke aplay from /dev/zero at system start.

[Service]
ExecStart=/usr/bin/aplay -D default -t raw -r 44100 -c 2 -f S16_LE /dev/zero

[Install]
WantedBy=multi-user.target

But after I ran this service nothing's changed (I still hear noise after changing tracks).

When I just run "/usr/bin/aplay -D default -t raw -r 44100 -c 2 -f S16_LE /dev/zero &" issue with noises is resolved.

What am I doing wrong?
How should I configure this service to eliminate noises?