Found the problem: The Debian source for the libparted package does not include the patch introduced by commit c6dc6e5d in 2015 (No official parted release since 2014, so picking commits is unfortunately needed).
Found the problem: The Debian source for the libparted package does not include the patch introduced by commit c6dc6e5d in 2015 (No official parted release since 2014, so picking commits is unfortunately needed).