Talewords have only included EditSceneData for a limited number of example scenes:
empire_village_003
khuzait_village_g
battania_village_k
sturgia_village_l
khuzait_castle_002
sturgia_town_b
battle_terrain_v
empire_castle_keep_a_l3_interior
empire_house_c_tavern_a
empire_dungeon_a
arena_empire_a
Main_map
sea_bandit_a
mountain_hideout_002
Any other scenes loaded in the editor lack editable terrain, making it invisible. I don't know why this was ever responded to as a bug report as it's a Taleworlds policy decision to reduce the download sizes. Hopefully, they will give modders access to more editable terrain in the future.