In CoreQuestLocations.xml for <QuestLocationType InternalName="QuestLoc_Palisade">, <DrawnIcon>Artifact_Bones1_ClothIcon.dds</DrawnIcon> references a .dds instead of a valid .png file. This leads to empty palisade icons on the cloth map.
The closest thing I could find was Improvement_Fort.png... recommend using that one unless of course you have a palisade asset laying around somewhere for the cloth map.