With the start of a new ISO test cycle it has become clear that all the partition changes in Calamares are not stable or usable at this time. Because of these changes kpmcore had been a git checkput for a few weeks in [build], which needed a partitionmanager git build too.
Both are now removed, since Calamares will need the stable kpmcore version.

As always when on [build] and packages get removed, update and then run:

sudo pacman -Suu