so here's what you need to do: open Sanctuarycampainmods.pak with an archiver
go into MapObjects and open the file Preserve.(AdvMapTownShared).xdb
scroll down to the very bottom of the file, there will be a list of buildings, in that list look for these lines
<Item href="/GameMechanics/TownBuildingSharedStats/Preserve/Dwelling_3/HighPalace.xdb#xpointer(/TownBuildingSharedStats)"/>
<Item href="/GameMechanics/TownBuildingSharedStats/Preserve/Dwelling_4/RingOfStones.xdb#xpointer(/TownBuildingSharedStats)"/>
<Item href="/GameMechanics/TownBuildingSharedStats/Preserve/Dwelling_4/Stonehedge.xdb#xpointer(/TownBuildingSharedStats)"/>
<Item href="/GameMechanics/TownBuildingSharedStats/Preserve/Dwelling_5/UnicornGlade.xdb#xpointer(/TownBuildingSharedStats)"/>
if the red lines are missing, add them, if they're already there then save the file so it becomes prioritized