How to delete IPv6 DNS Servers via command line?

Question

I can successfully delete IPv4 DNS Servers via command line on a Windows Server 2019 with the following command:

netsh interface ipv4 delete dnsserver "My Ethernet" all

After this command I execute ipconfig /all and see the following IPv6 DNS Servers show up (which were not there before):

...
DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1
                                    fec0:0:0:ffff::2%1
                                    fec0:0:0:ffff::3%1
...

I've (naively) tried the following commands neither worked:

netsh interface ipv6 delete dnsserver "My Ethernet" all
netsh interface delete dnsserver "My Ethernet" all