The 20100607-1550d changeset uses the 2=short tag to migrate to short concept name type and 20100607-1550f uses tags matching "preferred%" to set name types to be preferred and fully specified name (FSN).
The 20100607-1550f changeset needs to be fixed to set FSN to preferred UNLESS there is a row with DEFAULT=1 which would become the FSN...
This was discussed at https://groups.google.com/a/openmrs.org/d/topic/dev/i2rQNRmbh-8/discussion
1. If a concept has 2 names: "Oral administration" has the "default" tag and "Orally" has the "preferred" tag in 1.6.x then after the upgrade to 1.9.x "Oral administration" is marked as a FSN and "Orally" as a preferred name.
2. If "Aspirin" has the "preferred" tag and no other name for the same concept has the "default" tag in 1.6.x then after 1.9.x upgrade "Aspirin" is marked as both fully specified and preferred name.