AdGuard resolvers are resolving any domain with "rotator" in the name to 0.0.0.0

[b3n-j4m1n]

nslookup this.does.not.rotator.exist.example.com 94.140.15.15
Server:  dns.adguard.com
Address:  94.140.15.15

Non-authoritative answer:
Name:    this.does.not.rotator.exist.example.com.Home
Addresses:  ::
          0.0.0.0

nslookup this.does.not.exist.example.com 94.140.15.15
Server:  dns.adguard.com
Address:  94.140.15.15

*** dns.adguard.com can't find this.does.not.exist.example.com: Non-existent domain

This is for resolvers 94.140.14.14 and 94.140.15.15

[nmalcolm]

Also happening with "piwik".

nslookup piwik.example.com 94.140.15.15
Server:     94.140.15.15
Address:    94.140.15.15#53

Non-authoritative answer:
Name:   piwik.example.com
Address: 0.0.0.0