nmcliを使用すると、/etc/resolv.confからDNSエントリを削除できません。

Centos 7.5、nmcli バージョン 1.20.2

/etc/resolv.confからエントリを削除しようとするたびに、次のエラーが発生します。

[root@client ~]# cat /etc/resolv.conf 
# Generated by NetworkManager
search home
nameserver 8.8.8.8
nameserver 192.168.1.1
[root@client ~]# nmcli connection modify enp0s3 -ipv4.dns 8.8.8.8
Error: failed to remove a value from ipv4.dns: the property doesn't contain DNS server '8.8.8.8'.
[root@client ~]# nmcli device show enp0s3 
GENERAL.DEVICE:                         enp0s3
GENERAL.TYPE:                           ethernet
GENERAL.HWADDR:                         08:00:27:FA:EE:AC
GENERAL.MTU:                            1500
GENERAL.STATE:                          100 (connected)
GENERAL.CONNECTION:                     enp0s3
GENERAL.CON-PATH:                       /org/freedesktop/NetworkManager/ActiveConnection/4
WIRED-PROPERTIES.CARRIER:               on
IP4.ADDRESS[1]:                         192.168.1.8/24
IP4.GATEWAY:                            192.168.1.1
IP4.ROUTE[1]:                           dst = 0.0.0.0/0, nh = 192.168.1.1, mt = 100
IP4.ROUTE[2]:                           dst = 192.168.1.0/24, nh = 0.0.0.0, mt = 100
IP4.DNS[1]:                             8.8.8.8
IP4.DNS[2]:                             192.168.1.1
IP6.ADDRESS[1]:                         fe80::18c:3f05:dcaf:65fd/64
IP6.GATEWAY:                            --
IP6.ROUTE[1]:                           dst = ff00::/8, nh = ::, mt = 256, table=255
IP6.ROUTE[2]:                           dst = fe80::/64, nh = ::, mt = 256
IP6.ROUTE[3]:                           dst = fe80::/64, nh = ::, mt = 100
[root@client ~]# systemctl is-active NetworkManager
active