debian/scripts/plack/koha.psgi still references C4::Branch, which was refactored out of existence. remove the reference. retest the tests. t/db_dependent/00-strict.t should not be noisy about it.
My debian/scripts directory did not match a clean clone. This meant there was a directory plack which was out of date and triggering issues. Using git ls-files and diff with a file . -type f, I operated, re-ran, and this is a non-issue.