Can't add Trusted Domain for LAN

To not open a new thread about the same, I added 192.168.1.16…

sudo nextcloud.occ config:system:set trusted_domains 1 --value=192.168.1.16
System config value trusted_domains => 1 set to string 192.168.1.16

sudo nextcloud.occ config:system:get trusted_domains
localhost
192.168.1.16

But nextcloud insist to add the IP to trusted domains.