1.14.4 armor_stand not loading at all when loaded "procedurally", marker or no. By "precedurally" means as in an armor_stand placed within an nbt file of a default structure, which loads as the terrain is procedurally generated. This was specifically discovered when attempting to place an armor_stand statue in the entrance.nbt of the woodland_mansion structure directory. Marker or not, the armor_stand does will not load.