There are multiple ways a few zeds can spawn just as fast as the player and on respawn you could be very close to where you died and then its even easier for zombies to also linger.
Scout zombies can spawn as normal zombies in the world, without a console log or debug menu nobody would be able to tell them apart either. But I know recent changes to heat made things works differently, heat actions that previously went unregistered work now, so I might have to do another pass on heat generated by sound, I noticed that screamers can turn up rather quickly if you linger somewhere so there is that as well.
But in the end, it is intended to be challenging, no matter the source of the zombie spawn
In the next version I am giving the player a sleeping bag as starter item, this way people can better control their spawns, since its harder than vanilla to craft a sleeping bag.