Only set TBTR replacement game event flag when replacement action occurs

src/train_cmd.cpp

@@ -5446,6 +5446,8 @@ CommandCost CmdTemplateReplaceVehicle(TileIndex tile, DoCommandFlag flags, uint3
 		}
 	}
 
+	if (need_replacement || (need_refit && use_refit)) RegisterGameEvents(GEF_TBTR_REPLACEMENT);
+
 	/* define replacement behavior */
 	bool reuseDepot = tv->IsSetReuseDepotVehicles();
 	bool keepRemainders = tv->IsSetKeepRemainingVehicles();

src/vehicle.cpp

@@ -1388,8 +1388,6 @@ void CallVehicleTicks()
 		bool leaveDepot = it->second;
 		_vehicles_to_autoreplace.erase(it);
 
-		RegisterGameEvents(GEF_TBTR_REPLACEMENT);
-
 		/* Store the position of the effect as the vehicle pointer will become invalid later */
 		int x = t->x_pos;
 		int y = t->y_pos;