So that they are also mapped from the global qualities to the flsun_sr-specific ones. This way they will be able to still be used in the newer Cura versions.
CURA-8510
Since the setting version 18 is used in the arachne beta build, we decided to make the the setting version to 19 in the normal releases, so that we make sure that projects made in arachne beta won't use any version upgrade scripts if a user attempts to open them in 4.12.
CURA-8510