I think the core of the reason why this works for the build and for autopkgtest is that they are using the chroot that has been pre-generated, which points to unstable. Because piuparts creates a temporary chroot, it behaves differently.
It seems the solution is one of the following: 1. Add code to piuparts to rewrite UNRELEASED to unstable unless a distribution is specified. 2. Uncomment the $distribution section of the example .sbuildrc on the wiki, so that it works by default. -- Soren Stoutner so...@debian.org
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