build-source didn't create symlink to orig tarball in parent dir

andreas@nsnx:~$ snap info git-ubuntu
name: git-ubuntu
summary: Ubuntu development git tooling
publisher: nacc
description: |
  Imports, clones, etc. a source package in a git tree
snap-id: VAGSRAriUyDDlqsLunShJTe7503Uw4GF
commands:
  - git-ubuntu
  - git-ubuntu.man
  - git-ubuntu.merge-changelogs
  - git-ubuntu.reconstruct-changelog
tracking: edge
installed: 0.6.2+git14.c903505 (330) 99MB classic
refreshed: 2017-11-09 17:04:26 -0200 -02
channels:
  stable: 0.2.2+git11.9fa9149 (291) 110MB classic
  candidate: 0.6.2+git14.c903505 (330) 99MB classic
  beta: ↑
  edge: ↑

http://pastebin.ubuntu.com/25932036/ reproduced below:
11/10/2017 11:57:02 - DEBUG:Executing: /usr/bin/lxc exec valid-insect -- apt update
11/10/2017 11:57:04 - DEBUG:Executing: /usr/bin/lxc exec valid-insect -- apt install -y devscripts equivs sudo
11/10/2017 11:57:49 - DEBUG:Executing: /usr/bin/lxc file push /tmp/tmpp6c19ssu.tar.gz valid-insect/tmp/
11/10/2017 11:57:49 - DEBUG:Executing: /usr/bin/lxc file push /home/andreas/git/packages/landscape-client/.git/git-ubuntu-cache/ubuntu/landscape-client/16.03/landscape-client_16.03.orig.tar.gz valid-insect/tmp/
11/10/2017 11:57:49 - INFO:Copied build files to valid-insect
11/10/2017 11:57:49 - DEBUG:Executing: /usr/bin/lxc exec valid-insect -- grep -q ubuntu /etc/passwd
11/10/2017 11:57:50 - DEBUG:Executing: /usr/bin/lxc exec valid-insect -- sudo -s -H -u ubuntu tar zxCf /tmp /tmp/tmpp6c19ssu.tar.gz
11/10/2017 11:57:50 - DEBUG:Executing: /usr/bin/lxc exec valid-insect -- grep -q ubuntu /etc/passwd
11/10/2017 11:57:50 - DEBUG:Executing: /usr/bin/lxc exec valid-insect -- sudo -s -H -u ubuntu ls /tmp
11/10/2017 11:57:51 - INFO:Installing build dependencies in valid-insect
11/10/2017 11:57:51 - DEBUG:Executing: /usr/bin/lxc exec valid-insect -- sh -c 'cd /tmp/landscape-client-16.03-0ubuntu4 && (export DEBIAN_FRONTEND=noninteractive; mk-build-deps -i -t "apt-get -y -o DPkg::options::='--force-confdef' -o DPkg::options::='--force-confold' -o Debug::pkgProblemResolver=yes --no-install-recommends" -r debian/control)'
11/10/2017 11:58:07 - INFO:Running dpkg-buildpackage in valid-insect
11/10/2017 11:58:07 - DEBUG:Executing: /usr/bin/lxc exec valid-insect -- grep -q ubuntu /etc/passwd
11/10/2017 11:58:07 - DEBUG:Executing: /usr/bin/lxc exec valid-insect -- sudo -s -H -u ubuntu sh -c "cd /tmp/landscape-client-16.03-0ubuntu4 && dpkg-buildpackage -uc -us -i -I -S"
11/10/2017 11:58:08 - DEBUG:Executing: /usr/bin/lxc exec valid-insect -- grep -q ubuntu /etc/passwd
11/10/2017 11:58:08 - DEBUG:Executing: /usr/bin/lxc exec valid-insect -- sudo -s -H -u ubuntu ls /tmp
11/10/2017 11:58:09 - DEBUG:Executing: /usr/bin/lxc file pull valid-insect/tmp/landscape-client_16.03-0ubuntu4.dsc valid-insect/tmp/landscape-client_16.03-0ubuntu4_source.changes valid-insect/tmp/landscape-client_16.03-0ubuntu4_source.buildinfo valid-insect/tmp/landscape-client_16.03-0ubuntu4.debian.tar.xz ..
11/10/2017 11:58:09 - DEBUG:Executing: /usr/bin/lxc stop --force valid-insect
11/10/2017 11:58:10 - INFO:Successfully built:
../landscape-client_16.03-0ubuntu4.dsc
../landscape-client_16.03-0ubuntu4_source.changes
../landscape-client_16.03-0ubuntu4_source.buildinfo
../landscape-client_16.03-0ubuntu4.debian.tar.xz
using fetch_orig_from_cache(source=ubuntu)