Removed original proposed solution. Added new proposed solution. The issue seems to be related to potentially who to credit the kill with and certainly for the mission board quests the assignment of keywords. Quests that require a specific keyword will now receive that specific keyword necessary for completion.
Version 2.0
Fixed issue directly in vanilla script as the other workaround didn't seem to work out. Please let me know in comments if issue still persists.
Version 1.1
Due to a report stating issue persisted, this now includes the alternate solution recommendation of a direct script edit. If functional I can see about trimming out the no longer needed additional KO mechanic.