This still occurs in Focal. 
nslookup "respects the dots" as it calls the systemd resolver, and as per man 
resolved.conf(5)

Domains=
           A space-separated list of domains. These domains are used as search 
suffixes when resolving single-label host names (domain names which contain no 
dot)


to get this behavior on ping you need ping to switch to the systemd resolver 
("resolve" in nsswitch) which is achieved with apt install libnss-resolve

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https://bugs.launchpad.net/bugs/1674273

Title:
  Resolver ignores ndots option

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