swayidle randomly activating

[UltraBlackLinux]

I don't know what it is, but for some reason swayidle randomly sees activity, somewhere.
I have checked the debug mode, but it doesn't really help because it doesn't show activity sources. All I am seeing is that there's little to a lot of random activity from time to time, almost every 30 seconds.

I think it might be happening because of battery charging, but I'm not sure. Another idea would be gnome-calls. Whenever I run (even after stopping) the daemon, I get this behavior.

I'm running swayidle 1.8.0

Any idea what's happening?
Thanks!

[FriederHannenheim]

I can confirm this is happening to me as well on 2 different laptops. Swayidle is started like this: swayidle -w before-sleep cthulock. My OS is NixOS but it is happening on the other Laptop with Void Linux too.