Thank you for reporting this bug and helping to improve Ubuntu.
Why do you believe that the problem here is one of 'leftover state'?
The systemd-resolve --status output shows a simple config, with a domain
search list and two DNS servers (one ipv4 address, one ipv6 address).
If some of this state is "leftover", it's not clear what state that is.
Are 10.1.0.1 and fda0:5173:b519::1 the correct DNS servers for your home
wifi? Do these DNS lookups work correctly when you issue them directly
against the configured nameservers? (nslookup webvpn.purestorage.com
10.1.0.1; nslookup webvpn.purestorage.com fda0:5173:b519::1) What
happens if you try to do the lookup with 'nslookup
webvpn.purestorage.com' instead of with systemd-resolve? (systemd-
resolve uses a different protocol to talk to systemd-resolved, and may
give different results - which normally indicates a bug.)
Can you provide a network trace of the DNS traffic when these lookups
fail?
** Changed in: systemd (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1727566
Title:
extra left-behind domains break domain name rsolution
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