Solved a bug about iwm autoloaded

I found a bug in FreeBSD 13, I make a custom kernel without iwm(4) module and install it, after this I reboot my laptop. I found the iwm(4) module has been loaded automatically. There is no iwm(4) option in my loader.conf and rc.conf what's wrong?
 
It's automatically loaded when you access the interface. You probably have something like wlans_iwn0="wlan0" in your rc.conf. That's not a bug, the system is doing what it's supposed to do.
 
I don't have anything wlan related in /etc/rc.conf but this driver is still loaded. It seems to do it while going through pci devices during bootup. I wouldn't call it a bug though!


Code:
pcib3: <ACPI PCI-PCI bridge> at device 1.5 on pci0
pci3: <ACPI PCI bus> on pcib3
iwm0: <Intel(R) Dual Band Wireless AC 9260> at device 0.0 on pci3
pcib4: <ACPI PCI-PCI bridge> at device 8.1 on pci0
pci4: <ACPI PCI bus> on pcib4
 
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