Try to init town.difficulty: set it by default to scenario.difficulty

src/fileio/fileio_party.cpp

@@ -264,7 +264,10 @@ bool load_party_v1(fs::path file_to_load, cUniverse& real_univ, bool town_restor
 					}
 				}
 			}
-		else univ.party.town_num = 200;
+		else {
+			univ.party.town_num = 200;
+			univ.town.difficulty = univ.scenario.difficulty;
+		}
 	}
 	
 	real_univ = std::move(univ);

src/universe/universe.cpp

@@ -1393,6 +1393,8 @@ void cUniverse::enter_scenario(const std::string& name) {
 		for(auto& m : sector->maps)
 			m.reset();
 	
+	// time to init the town's difficulty
+	town.difficulty = scenario.difficulty;
 	party.scen_name = name;
 }