I could be wrong but I believe all weapons, even bows, make some noise, and this is intended.
Remember, zombies technically go to where they last sensed you, rather than where you are. You can leverage this behavior by slinking away as soon as a zombie senses you. We even have an immediate tell now: the stealth meter turns yellow when you’re sensed, and green when you’re not. Navigating this in between, “I sensed you recently but I can’t sense you presently” state is arguably the most important part of playing stealthily.