Got a tier 2 quest at house_old_ranch_05 and couldn't find a marker. I checked in the POI editor and also looked at the XML file of that house as well as 04 and 06. There's no rally point in the XML for house_old_ranch_05 and no marker shows up in the POI editor.
Steps to reproduce:
Open house_old_ranch_05 in POI editor.
Try to start a Fetch quest.
Screenshot is from in-game, taken right after pressing the show on map button, which did not work.