The image comparison was done against the old release in the channel
we release to instead of the previous release with the same major
version. This means when a channel transition happens we see a large
diff instead of the diff against the previous release. While not bad
for finding problems, this is normally not needed. However, we want
to have two changelogs generated, one against the old release in the
channel we relese to and one against the previous release with the same
major version when a transition happens. There was no changelog
printing yet, and this is added now.