Thanks Simon, the comment on the potential parallel search is great and
could be the source of your leak.

>From the trace you sent it seems when shrunken down to the path like
this:

# you first ask local dnsmask
;; Received 239 bytes from 127.0.0.1#53(127.0.0.1) in 0 ms
# that then asks main dns servers
;; Received 866 bytes from 202.12.27.33#53(m.root-servers.net) in 400 ms
;; Received 678 bytes from 192.5.6.30#53(a.gtld-servers.net) in 77 ms
# dns service provider
;; Received 107 bytes from 204.13.251.27#53(ns4.p27.dynect.net) in 197 ms
# canonical name server
;; Received 171 bytes from 91.189.91.139#53(ns3.canonical.com) in 134 ms

But if I understood dig +trace enough it does so by understanding the dns reply.
So your local dnsmasq or such on 127.0.0.1 is reporting "answer from 
202.12.27.33#53(m.root-servers.net)" - then it asks this server next which then 
answers ...

If anything it seems that already your local dns cache/proxy is not
asking your "in-vpn" DNS but a public one.

Configs will certainly help a bit in trying to understand that.

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https://bugs.launchpad.net/bugs/1685391

Title:
  DNS leak in Xubuntu 17.04

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