At least 8 pistons activated simultaneously halt the playsound

What I expected to happen was to use the playsound command.
After that I activate at least 8 pistons simultaneously and this activation halt the playsound

Steps to Reproduce:
1. place at least 8 pistons with blocks above them.
2. Place redstone dust on these blocks and a lever connected to redstone
3. use a playsound command
4. Activate the lever (and the pistons). The playsound is stopped. If it is not stopped, desactivate redstone and reactivate it.